The setup is actually already planned as completed. I see no problems with access to the living room at the back, and I don't see a "hallway" here either. It's not a public space where some stranger could suddenly be standing behind you. In general, I am not a fan of squeezing a sofa against a wall, which for example also complicates surround systems, and the distance to the TV would be way too large for me. I was only concerned about the piece of wall, whether it would be nicer for reasons of symmetry, or whether the look of a full window front would be nicer.