In my experience the TVMs in Berlin were fine, but it was easier to just get the app because I don't make a habit of carrying around a ton of cash. The biggest

In my experience the TVMs in Berlin were fine, but it was easier to just get the app because I don't make a habit of carrying around a ton of cash. The biggest problem I had was the TVMs at the Frankfurt airport, half of which were broken, and none had a clear explanation of what the different ticket types were.