One more interesting thing is the wallpapered corner which is modified Plane primitive object.
Take a look at the entire room model
It's a simple box with some details like holes in the wall for the windows. We don't normally see the entire room but it's needed for achieving the proper lighting.
Lighting and Rendering
Ok, for the lighting I've used only 2 emitters: 1 direct light that simulates the Sun (with some yellow/orange colour and area shadows) and one V-ray light right behind the window to simulate the day light (almost white with some green and blue values, but this depends on the environment basic colour).