Would you consider building a closet that would hold the platform on which your mattress would be placed? The outer side of the platform could have drawers or doors to the storage units under the platform. This kind of enclosure would work better for a twin bed than for a double, but it would provide a place where the bed can be concealed during the day time. Then, if you could allow a path between the bed enclosure and sofa, you could have the sofa face the dining table, or you could place the dining table at a right angle to the end of the sofa.

In the empty space between the cabinets you can have such floating shelves to place books or any display items. You can buy them online o even get them made at any carpentry shop. You could have white to keep the uniformity or blue as a contrast to the white cabinets and matching the blue skirting and table top and the wall too. As a DIY you could instead make a french memo board in a a kickass grey or beige and keep your memos, notes, photos and everything else. Hang your earphones and cables from it, keep your guitar plectrums etc. You will find lots of DIY tutorials for this. This could go well in the space between the cabinets as well and gel with the study area.

Add some colors on the ceiling. Go for wall paper on the back side of the bed wall, plus beautiful wall lamps on either side of the bed unit, put some good picture, change the t.v. unit if possible.

work in three basic steps. 1. Paint the walls in a neutral shade like grey or beige.2. Go for wooden furniture in polish like walnut or pine colour (light brown). 3. Then choose any accent colour like red, navy blue, wine chocolate etc of your choice. Buy curtains, rugs and bedsheets of this one shade in solids. Then go for a couple of accent pieces like two frames or two lamps in white, gold or silver (again of your choice ). Done! this can be completely transformed very easily only by chanign the accent colour once you are bored..! all the best..