You can scroll through a hundred sofa listings online and still end up with a model that forces your guests to sleep slumped against the armrest. I have been there. After three sofas in five years, I learned that the single biggest mistake people make is forgetting their sofa has to work for actual living, not just Instagram shots. Choosing a living room sofa should start with a brutal self-honest conversation about what happens on that piece of furniture after 9 p.m. Think about your actual floor plan. If you live in a flat where the living room doubles as a guest room, a sofa that only sits three people upright will become a source of frustration. You need something with a hidden function. Something that turns from a seating area into a real bed without requiring you to restack pillows and cushions in the dark.

The click-clack mechanism changed my entire approach to small-space living. I was skeptical at first, because the name sounds like a toy.