we need more info - floor plan with measurements, windows, exits. Do you plan to have a TV in there?

We agree with Valinta. Measurements will help a lot. A rough draft works. How many people will be using the room daily and how many guest do you want to accommadate?

Guessing that applied stone is applied and could be removed. Or you could paint it like this inspiration photo.

Face some accent chairs toward the window and a sofa in front of window. Rug, coffee table, art, lighting will take care of that end of the room. White draperies will work, but you want a lined linen, slubby look.

To the right of the window, consider a large wood piece.