I wouldn't go less than 1200 width if you can avoid it. Depends on the scale of the house, eg a small apartment 1000 may be suitable, a larger, more grand home, you'd want it to be wider to be in proportion to the rest of the house. Without seeing the whole plan it's hard to comment too much - I'd hand it over to your Architect or Designer to come up with a few options :) A couple of ideas maybe are to make the other side of the shower (facing the vanity) glass - so glass 2 sides. That'll make it feel bigger than a solid wall. Also a wall hung vanity will give the illusion of more floor space and make the space feel bigger. All the best!

I would definitely have some way of closing off this area like a bifold as suggested by Janine Ferris, as a computer area can often look messy with books, notes, kids homework etc... If this room is going to open into the dining/entertaining area, you may want to be able to hide it from guests when you've run out of time to straighten it up!! Not sure that it would work as a charge station as suggested by fiona_ab, as I can't see an entrance close by but if it is, then it would work great. As for how this room would affect re-sale, think of yourself not a stranger that might live in your home a lifetime from now. I'm also currently building and so many people comment about this or that being great for re-sale and I say that I'm building for me, not someone that might live in my home when and if I ever sell. If you constantly go through the building of your home thinking of re-sale, it could end up being a beautiful but sterile home, like the ones in magazines, where things are perfect, completely void of character, that only you the home owner can put into it.

How about keeping the framework of the enclosed patio and the wall but opening it up... so pull off the roofing but keep the trusses... and grow some vines like a bouganvillea on a trellis over the area. It would protect your privacy and not waste the infrastructure of what has been built, but it would give the spot some beauty and street appeal. Bouganvillea or a similar brightly coloured vine would look amazing. Maybe a combination of vines so that you have maximum flowering... so some autumn leaf colour, summer flowers, spring flowers... think romantic like wisteria, jasmine, clematis, rose... or bold and tropical bouganivillea and mandevilla. You can paint the trellis a contrasting colour to add some appeal while the plant is growing up. Pulling off the roof will bring better air flow and light back into the living area.

I will move the laundry to the small bedroom location. This means I can remodelled the kitchen using the existing laundry space as a pantry or something else. I will remove the wall in the Living area to have the dining table locate there. You can rotate the dining table in parallel with the new laundry room. Will remove the wall on the right side from the front door and that will now be the entry to the Living Area. Will put in a new wall in alignment with the bedroom wall. This will allow to put in a small low display buffet table with a mirror hang on the plaster board wall facing the front door. This will make the space more open and allow for a sliding door to the decking area. To enclose the Alfresco area properly, you will probably need to pull down the existing roof and structure. The cheaper approach is to use the existing structure and use cafe roller up and zipper blinds to enclose it. You can also use timber framing and polycarbonate sheeting to give a more "habitable feel" enclosed room if you are happy to spend a bit more money without ripping the existing structure. Good luck.