You have all the reasons to redo the house, its very lifeless and looks worn out. I feel creating a separation will terminate the spaciousness of the room. Adding colours will surely help, Since you have a tan color sofa,I suggest grey, white or light blue color on one of the walls. Add some art works of the color you chose for the wall. This room needs some fillers like , books, throws, candle stands tall and lean. YES DON FORGET 1. Mount the tv on the wall make some space on the floor and Fix a large size mirror ( Wooden Frame if you can afford).

Do you live in a warm country - then you might want cool colours: pale blues, greys or greens. I would leave your bathroom as it is - love the niches. To add some cosiness to the marble floors, find a nice cream carpet and cream furniture and then use this as your base for colours that you like. BTW what colours do you like? What inspires you. When you travel or go out ... what is that makes you happy? This will help

Here's the proper floor plan.

Usually the builders provide a separate control for each unit. Surprised to know that they don't have such basic control. You should try to fix it as soon as possible. Nitin Cornerstone Designs