I don't know about kindermusik, but my kid went to my musikbox when she was 2. We went to the CWB center which was pretty spacious and clean and the teacher then was enthusiastic. You can go and have a trial first.
At the beginning if u are not sure, u can ask them whether you can pay class by class first for a few more lessons, although it will be more expensive this way. I think that's what we did too.