My wife and I stayed at the Cassa400 for a five day break in Feb 2012 and can't say enough good things about the place. The staff are cheerful, helpful, all speak good english and are happy to help in any way. we have stayed all over the world and have yet to find a better hotel. The rooms are large, well lit and even provide a safe in your room. I would recommend this hotel to anyone.
As for the comments by 'serious traveller 01', I don't know what hotel he stayed in but it sure as hell wasn't The Cassa 400 in Amsterdam, because there is plenty of room for cases (we had 4 large cases, two smaller cases, and a couple of holdalls). as for the bath room the shower is good the mirror is positioned above the sink (where does he want the mirror to be, on the ceiling?!).