I agree with both antonia_d re sheers and fiona_ab
re Romans. As you are familiar with Romans, and have them elsewhere in
your home, I’ll keep my suggestions on the main, along the lines of
Romans, although I will start with some possible drapery options also
worth considering

Curtains:

1. Block-out Roller-blinds + Ceiling fixed S-fold track.
I
would suggest a small square profile track. This can be attached to the
ceiling (ceiling fixed). Here we are not trying to make a feature of
the track, rather the shape and form of the curtain. Depending on the
sheer that you select, this combination solution may be a more
affordable option than the other options that follow. The amount of
fabric meterage will be significant and the price per metre of sheer
fabric can range quite substantially. Here in Melbourne, sheer textiles
can range from $25 per metre to $200 per meter. Although it is difficult
to assess from the image, you would likely require in the vicinity of
9-10 metres and that is just for the fabric. With an s-fold the
correct fullness is about 2.2 or 100%.

The black-out roller
blinds, as their name suggests, would complete the treatment providing
the ability to block out the light. Their insulating properties are
limited.

2. Block-out Roller-Blinds behind Eyelet curtains on a decorative curtain rod.
If
you are lucky you might get a single finial on one end of the rod but
the more likely solution would be straight end-caps. Fabric
considerations will still be the same as for an s-fold track.
Personally, I think the Eyelet curtains for this space would appear a
bit ‘dated’

Depending on the ages of the children, another
consideration in favour of Drapery (curtains/sheers) over Romans will be
caring for your treatments. You can’t wash Romans, or even dry-clean
them. Spot cleaning is your only real option.

Depending on the
fabrics selected, many curtain fabrics can be washed and/or
dry-cleaned. This may be an important consideration if grubby fingers
are an issue within your household. There are two sides to the coin
though. - Romans are less likely to be damaged due to being pulled or
frequently hand drawn instead of say a chain and track mechanism.

3. Romans.
Moving onto the Roman Blind
options, I think it important to note that the Romans you have in the
other room look to be more ‘Casual Romans.' These are not lined, rather
they are self-backed. There is nothing wrong with Casual Roman Blinds
but you would be somewhat limited over the choice of fabrics in
Australia, Here casual Roman Blinds are limited to plain fabrics such as
the ones in your daughter’s bedroom. They are, however, a much more
affordable option, though be it at the expense, perhaps, of your ability
to be creative and make a design statement in the play room/tv room.

Casual Romans require and utilise a pre-stiffened fabric or you will end
up with you blinds coming to resemble ‘London blinds’ due to shape
distortion and sagging. .. Not a good thing. (and an insult to
beautifully made London Blinds)

The other type
of Roman Blind common in Australia are called ‘Traditional Soft-Roman’
blinds.’ These are lined with pre-stiffened Roman Lining which provides
shape stability over time, and offers far superior insulating qualities
over Casual Roman blinds because of the lining. They are more
expensive not only because of the lining and the labour involved in
their manufacture, but because they offer a far greater choice when it
comes to fabrics; fabrics which could vary greatly in price, depending
on the choices you make. If you want to make a design statement with
Roman Blinds, then Traditional Soft-Roman Blinds are the way to go.

Reading
your post, I think it also worth advising that that you should not be
afraid of departing from Romans. We have implemented many solutions
with Romans and traditional drapery (eg; curtains and/or sheers) within
the same room and even mixing them for the same window.

Here are some examples I have found from other professionals on Houzz:

Hamilton Residence · More Info

Summerlees - A living piece of Australian History · More Info

Examples of mixing and matching of window treatments within the same room

As jenpotts
pointed out, you are lucky in that you have the space above the
architraves. Mounting the Romans high, they will stack back above the
height of the French doors. - So no ducking or blinds catching on the
doors if fully retracted (stacked back/up) - It’s hard to tell from the image whether the
doors open inward or outward. The bolt would indicate to me that they
most likely open outward which is also an advantage.

With an all-Roman solution you have several options that could be considered.

Option 1 - Roman on the right-hand window and two additional Romans split at the centre of the doors.

Option 2 - Roman
on the right hand window and 3x Romans, one on each side window of the
French doors, and a single Roman that would cover actual doors.

Living Room - Pattern mix · More Info

I
would not advise 4x Romans (one for each door panel and the two
adjacent panels), primarily because you have stated the doors aren’t used
often and in order to keep costs down, but what I would suggest with
all options, is the addition of a single pelmet across all the windows. This
would tie them all together off nicely and really add to the
presentation of the window treatments collectively. It would also
‘level out' the appearance of the windows. The one on the right looks a
little out of place extending up above the height of the French doors
drawing the eye and detracting from the overall look of the windows
'collectively.' - A pelmet would level this out, but the downside is that
the stack-back on the ‘high’ right-hand window will cause you to lose
the upper most portion of that window, with the viewing area reduced to
the height of the windows in the French doors and their two adjacent
window panels.

The Cliff House Hotel, Southbourne · More Info

Here
is an example of an extended pelmet that ties the individual blind
treatments together. Also notice the addition of the sheer/organza on
the right hand side, once again demonstrating that mixing and matching
window treatments between window and within the same window treatment is
fine.

With regards to pelmets. I would
suggest a pelmet with a deep fascia… around 25cm. You want the pelmet
fascia deep but not too deep so as to overpower the overall look of the
window treatments (as a whole). Your pelmet can be padded and lined and I
would suggest a coordinated fabric rather than the same fabric you use
for the blinds. It’s a real opportunity to make a make a design
statement, subtle or otherwise, and will do a lot for the overall
projection of the look you want for this room.

Ensure you go for a good quality Traditional Soft Roman Blinds.
Good quality Roman blinds use pre-stiffened lining rather than normal
curtain lining (which is not pre-stiffened and 1/3 of the price). Pre-Stiffened lining is
important if you want to maintain the shape of the Romans over time,
without them sagging on you. They will also provide far better
insulating qualities than cheap Romans made with regular curtain
lining.

Going 'chain operated' for all the blinds is
not an insignificant additional cost given the number of blinds you may
elect to purchase, but definitely a decision you would not regret, going
forward.

This room has potential. Take your time with it, do it justice, even if it means deferring your decision till you can fund it (if that becomes an issue). ... You will have live whatever you purchase for quite some time so it is advisable to take your time making your decision(s) so that your window treatments will be a source of pleasure rather than a source of regret..

Looks like this is a lounge room so you are not necessarily looking for block out. You could put a frosted film on the French door windows for privacy, either just lower panes or both and a roman blind on the sash window.

No matter what you choose for window treatments make sure they're at the same height!

Kevin please stop using these old posts to advertise on this forum