Thank-you both for your input! I think I'm tossing up between putting the chairs in the nook or against the long wall. If chairs go in the nook, it's cosy and there's more walkway space as you said, Luke, for beanbags etc. However, what would I do with the 2m wall near the entrance? Would seating there be a bit odd? However having the screen in the nook would allow for a longer row of seating I think? So potentially more people could fit in, although those sitting near the door may have an obscure view of the screen. It seems like both options have pros & cons! We don't have anything that needs to go in, so to speak, although plenty of seating options and tables for drinks etc would be really great!

Many years ago, we had a friend that wanted to make his whole house out of exposed concrete with curving walls................. wonder what ever happened to him?? As for me, ah, no!

With a family of five, I think a large corner/modular sofa would be a practical choice and would also work well to help define the two separate spaces in the large living room. All of the fabric nominations look nice, although I'm personally not a huge fan of the one with stripes. I think they all provide a Hamptons feel. If your family has young children, then I would be tempted to go with the most stain resistant and hard wearing of the short-listed fabrics.

Of course its all about how your going to be using it and the layout. If you cozy up with a pet, human or animal, how that will play out. Are you watching TV or a fireplace or both. Think about windows and how they will reflect onto the TV at different times of the day. Is it a space you read in or play games etc. Also, children and pets or partners grubby socks, does it need cleaning all the time or be stain resistant. Comfort of course plays a huge role or you won't want to use the space. I would think on those things first. Remember its a big purchase and should be in a neutral color, I always gravitate toward a grey or dark leather, to ground the space and liven it up with texture and color by pillows and throws. Good luck