I have a nice 45qm flat with two rooms. In Cologne-Mülheim very close to the Rhine and to the Wiener Platz, where you can drive in the city within 10 minutes. My expandable couch is comfortable but my flat is build without doors so it's like one big room where's a distance between us and something like a cut, but actually we sleep in the same room. I also have a bunk bed where the upper side isn't used so it can be use for sleeping as well.