HI -- If you could find a squared console or buffet cabinet that will fit against the side of your big cabinet that is close to the style and color of the big cabinet , then place the TV on top or hang the TV on the wall with a swing bracket . Then add a, just as long, floating shelf over top of the TV .at a level no higher than the top of the big cabinet. Ikea might have something that would work for you that is black or something you could paint to match your big cabinet.

did you need further help? if so can you give us the depth and height of shelves?

Firstly, one can play a lot with furnishings if you are staying in a rented apartment. those white walls are nothing but a clean canvas and you can really use colors through your furnishings like cushions , upholstery, curtains , rugs etc to add colors . Secondly , instead of wall shelves etc add small side tables on emptycorners you get etc which gives you platform surfaces to display your nick knacks.. You get many freestanding display shelves online and in market where you don't have to use screws in wall. :)

i dont know what it is called but this is lengthy room. in front of the house. so guests and people come here and talk and rest as well if required. but i spend most tome here so i know if anyone has come to the gate calling. i have students here so i teach in here, you can see the white board. its brighter room than others. so i study here. all in all this is my favourite room