Two years later... We ended up purchasing a 3-seater for wall opposite fireplace, a 2-seater for under the highlight window (leaves a comfortable space to enter the room) and an armchair placed diagonally opposite the couches. I've fooled the advice to pull the furniture in off the walls a little. We have just updated the fireplace with the (professional) installation of an insert wood heater and (DIY) replacement of hearth and tiles/timber mantel to conceal the brick while meeting the safety specifications of the heater (required a much wider/deeper hearth than the existing brick one so we removed and replaced with a slab of honed granite, and the minimum height for breastplate/mantel shelf posed a few design limitations). TV mounted above fireplace to allow for better furniture placement. Not quite the picture I had settled on 2 years ago, but works with the style of updates we have made elsewhere. Thank you for all the advice. before: After:

2 sofas look great when you are needed extra seating for people but i really like the armchair /wingchair idea with a sofa. As you have chosen a modern take on deco i would look at a side table that encumpases that style but as said functionality is key. No good having one sofa if you have 5 guests. It sounds so beautiful so keep moving with your ideas and remember that sometimes ideas can change with different advise but you have to love it

Is it a rental? Are those linen bags in the background? Is so, armchairs with wooden arms would wear well and match the coffee table.

Your room is so light and bright, you have a wonderful balance of colour and neutral already! But you have a lot of light colours that make the room look as though its 'floating' and you have an impressive art and objet d'art collection with red and bold colours - so I actually think a couple of small accent chairs in a dark cognac leather or vinyl would work well and anchor the scheme, especially if the chairs were an open-arm timber design (like below image) so the timber matches with your existing TV cabinetry and coffee table and the open arm design does not look so heavy. Also you have nice high ceilings so I wouldnt go for a chair that was high in the back, this would throw the symmetry of the room - keep the accent chairs about the same back height as the sofa