I'm not sure how big the room is, but maybe you could place the tv on a tv stand on the wall with the windows. Then, you could float your sofa across from the tv. I think by doing that you'd kind of divide the relaxing & eating space. I'm no pro by any means, but I hope this can help some!

i would put the tv on the little wall between the staircase and the dining room and then put the couch across from it. or chairs you watch tv in. make others face the sliding glass doors for view.

otherwise i would put tv on wall of staircase. eitherway i think i would mae it like an accent wall. paint it dark or wall paper in such a way that tv doe not stick out.

Below is a creative solution for your TV, maybe try it on a swivel? You might also be able to do a layout similar to this one.

Urban Elegance On The Lakefront · More Info

Urban Elegance On The Lakefront · More Info

Leeward Renovation · More Info

If you ever need customizable furniture, you could look into Famaliving California, where you can have sofas custom made to fit perfectly in your room, plus, you have a lot of options for colors (more than 600 to choose from).