You need to keep the walking flowing. Is the light fixture in line with the hall doorway and the door to go outside? I am thinking you could do two loveseats. One on the wall and another dividing the rooms as a "wall". The table could go between the "wall" loveseat and the island. Your walkway would be a circle around the table. My friend has hers like this but she has a square table. I think round makes the table seem less in the way than a square would. If you did this you would not want a long sofa table behind the "wall" sofa because I do not think you have enough room. You have windows like I do, really consider how much light will glare on tv if it is put on the windowless wall. I finally got shutters which help but am now resorting to the tv over the fireplace. I was also thinking a sectional would be great in your space but some would not like that you can only get to seating from one opening. But it would give you good direction and seating for tv viewing. A "wall" would give two entrances to that area. You could possibly do a sofa on the wall and float a loveseat, but that depends on wall length of course.

Honestly, don’t waste your time and money on this apartment. Anything you add will be on your $ and with 3 dogs and a temporary room mate, I wouldn’t invest in anything.

It's always difficult to position furniture in an open floor plan, especially when there are so many walkways and doorways. I would place a sofa on the long wall to the left of the fireplace, and another sofa perpendicular to that facing the fireplace. That defines the seating area. Then add a console table behind the sofa facing the fireplace, a coffee table in the center, and end tables on either side of the sofa on the long wall. Add a club chair to the right of the fireplace, an area rug and you're all set!

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.