Polonia / Polish polka dance lessons in Amsterdam [5]

A great friend of mine is having a relationship with a Polish woman. He loves her very much. He actually wants to impress her by knowing how to polka so he can surprise her with it. For his B-day we would like to take him to a place in Amsterdam where he can learn the basics of Polish Polka dancing.

Is there anyone that knows where in Amsterdam Polish Polka lessons are educated ?
Thanks a lot for your help!

Regards,
Remco