For Berlin not great
There are constant problems when trying to hire and return bikes. I check that it’s in an area that’s fine to return the bike and I get fined about 50% of the time with the app saying it’s incorrect. I’ve started taking screenshots of the map display everytime I park to prove that it’s in the pink zone. It’s hard to contact them and impossible to send photo evidence. Where I live in Berlin there are rarely any bikes for use, and the map doesn’t show where they are correctly. In addition the app constantly bugs during use and doesn’t allow you to return the bikes, or says you’ve returned them incorrectly. Often the app isn’t working so you can’t submit feedback. 75-85% of the times I use the app I have a problem.