(I'm not making this a regular thing, don't worry).
I used to say sitting room, but like settee, at some point I switched over to living room. I'm a Londoner, but had a Midlands mum.
Following on from the other post, I think if you say settee, you probably say sitting room. If you say sofa, you probably say living room or sitting room . Lounge definitely goes with couch.
Which term do you use, what region are you in/from? I'm not counting front room, because that's a separate thing imo. The front room is the good room, or "the parlour" if you're posh.
Where did you get that pic of my nan's house from?
From your nan's house.