another shot of the other side

Its a nice big room where you can use a large area rug and even a sectional if so inclined. Your focal/feature here is the fireplace. I think a credenza 25% wider than your TV will work in the recess. Hang the TV on an articulated arm for adjustability. Consider top down/bottom up shades to give you some privacy from the neighbors.

Another voite to remove the fireplace and hearth. Will you keep a desk area? If so, I would move it to the wall left of sliding doors, put the sofa table on the wall where the desk is now and the sofa against it. A lamp or two on the sofa table. Sleeper sofas are super heavy and sometimes not that comfortable to sit or sleep on. For comfort, a left hand chaise would be nice for TV viewing. With the FP gone, the TV could go to the left a bit and could sit on a small media cabinet. Rig sized correctly and a small round coffee table. ETA: After looking at photos again, I see that is NOT a desk area. If FP is removed, you could use that chest on the "new" wall with the new/smaller TV on top or hung above.

IMO usually if you have 2 sofas they should match . Why not just do the sofa and 2 chairs maybe in a fabric for the chairs and thethe chair you havas mentioned can go somewhere else you only have 13' so even the sofa you have only allows 3' walk space and only 3' infron of the fireplace unless you put the sofa to face the fireplace and a cahir on eachside facing each other so 2 more chairs would be perfect .