Hi
We have been to this class with my little girl and she loved it, the lady could speak English and to be honest not much language needed during the 30 min class apart from me asking questions....ofcourse all the songs are in German.
this is the website and they run in different places
www.babys-im-wasser.ch

other links you may want to look at;
http://www.acquababy.ch/

http://www.baby-schwimmen.ch/

http://www.wassererleben.ch

Happy Swimming
Tala