We just stayed for a night in Cassa.
Room is really small and bed smaller for 2 people. But it was neat & clean. Bathroom was spacious with satisfactory amenities and of course with a single bathrobe for 2 people... ;) ....
Staff of Cassa is really nice and helpful. We really liked their hospitality.
The location of hotel is just perfect. Even if its in bustling area of Manhattan, you wont listen all that chaos in your room. One negative thing is that, room doesn't have any view at all. We were on 14th floor with a view of a building right next door.
Times square, Rockfellar center and all major sightseeing are at walking distance.
Overall...its a nice hotel & I'll be definitely recommending it.