Thank you sandra.
They grow surprisingly well in pots as long as they are large enough.
The problem is to get rid of the mosquito larvae. None of the garden centres can offer a solution for that, yet.
If you don't have much room and if you can only have one try to get a Nelumbium sp. (Lotus) instead of Nymphaea (Lily). I think they are more fragrant and the flowers will last longer too.
I can't find them anywhere here.