So this is what I would suggest. Obviously, I don’t have room dimensions so this is just conceptual. When looking for a sectional, go with something with legs and not to bulky. I recommend taking painters tape and marking it out on the floor so you have exact dimensions. Also look at manufacturers that have an “apartment size” line. These tend to be smaller in scale overall. I would incorporate a free-standing fireplace into your tv console and also shelving units so that it feels like a built-in piece. Consider adding wall-mounted lights (plug-in) over the sofa and bookcases since you have no overhead lighting. You can hide the cords with covers that are paintable so they blend into the wall.

Pic of fireplace/tc console.

Tv/Fireplace Console

I agree with Nancy that its a little hard to do without dimensions and I really like the fireplace console she suggested.

Depending also on the style you want for this room.

Below are some ideas for style and furniture placement with one very similar to what Nancy has noted as well but adding seating by your window.

You can select the layout you like then measure and tape out the size if pieces you need and the style you want to you'll the room together.