So...I kind of became an expert myself on shitty old buildings. I had a shitty lift before, and a not very good one now. But that's what you get when looking for cheaper rent, I guess. Previous case it was originally Chinese made, and Otis took the contract around ten years ago. Problem is, they fitted European lift parts into a Chinese-made lift from a company no longer exists, and all the maintenance they were doing was pretty much custom-made for this lift. It tended to fail at least once every two weeks. In the end Otis ended up raising the maintenance fees a lot, as apparently the situation was unmaintainable to them, and they offered a contract to install a brand new lift. But this involved redesigning also the lift gap in the building, which was non-standard size either. So...when I left that apartment, they were going to take down the lift service for 3-4 months to install a new one. So...that's that.
My lift now is also very old and has very frequent maintenance checks, but it's not close to the previous one's unreliability at all. This one's worse teller is exactly what you pointed out, not landing exactly where it should, stopping 10cm earlier or later than it should. This usually is a tell-tale that the lift will hang soon (I guess the distance where it lands ends up being bigger than the doors safety mechanism to let them open), and will require some hours downtime to be readjusted by the technicians. It kind of happens once every month or two. Usually within the week when the misalignment starts. So probably you can use that yourself as a telltale sign of the lift soon to have some downtime.
EDIT: LOL, talking about the devil...seems I might have another downtime coming soon.