Mini velos are cool. Mine (a New Albion Microbrew, which is basically the same as an older model from Soma that I think was just called the Soma Mini Velo) fits in my cubicle at work, and is relatively easy to carry in stairwells. Also smaller diameter wheels are stronger, so good for fat cyclsts. Added bonus, you always look ridiculous riding it. Unfortunately I haven't used it in forever because of pandemic conditions. (I'm a transportation cyclist so if I'm not going places it's hard to to get myself on the bike)
It's called Ladybug:
