I learned about wall finishing the hard way, with a soggy towel draped over a chipped corner and a guest sleeping on a 12 cm foam mattress that slid off its frame every time she rolled over. The problem wasn't the mattress it was the space itself. Small floor plans force us to cram a sofa bed into a room where the walls feel like they are closing in. The wrong texture, the wrong color, or the wrong sheen can make a 3 by 4 meter box feel like a prison cell. I have been through three rental apartments and two renovations, and I can tell you that the surface of your walls is not decoration. It is the anchor for every piece of furniture you put against it. Get it wrong, and even a high quality pull-out sofa will look like an afterthought.

My first mistake was choosing a flat matte paint for a room that doubled as a home office and a crash pad for overnight guests.