the fire place

Well, I am going to make two assumptions...you cannot paint and the window coverings have to stay?

I think you should pick one room to start with. I would choose the living room. I am not sure of the layout because your fireplace picture is short. The first step is probably to get furniture layout properly set. The couch is a neutral (which is awesome) because you can pretty much select ANY color for accent pillows. Is that an outside bench by the fireplace? I think you need a closed off TV stand if you even desire having one.

What are your thoughts on a slimmer end table (replace existing) and then add a chair? Is the fireplace one that has a lower mantle that is specifically made to accommodate a TV?

TX Rcarterworld. yes the bench should go to the balcony and it's a TV stand. I won't be able to paint the apartment. I like the fireplace, I'm open for any ideas. like some mirrors,candles and wall decor as well. would like to add an accent chair.

you need color. A woven rug for the living room and maybe some curtains? Pillows for the couch. A quilted headboard for the bed in a bold color would be nice for the bedroom and some simple side tables. You have a very netral palette, so trying to find some things second hand might be a good idea is budget is super tight. Ikea also has some nice woven rugs at a reasonable price if you have one nearby.