Bicycling is not a hobby for me. It's a mode of transportation, after having tried cars for a decade and not being able to handle them. Bicycles are manageable. They are portable even in the other main mode of transportation I use, namely trains.
Inside a small apartment, a good way to store a bicycle is on the ceiling.
Unfortunately, the walls of my apartment are more sand than cement. so I cannot fix anything on the walls, much less into the ceiling. Luckily I have a tiny cellar space that is just big enough for two bicycles side by side, but then nothing else fits in the space.