Whatever you provide for aircrew they will rarely be happy.
But having said that you can learn a lot from what NH Hotels do for crew in Hoofddorp and Amsterdam
Schiphol, Kruisweg 495. 2132NA Hoofddorp - KLM use this hotel for their UK crews.
Amsterdam, Hobbemakade, 50. 1071XL - This is a 4 Star hotel and provides quality services for crew. Many japanese airlines use it.
NH Museum Quarter Hotel in Amsterdam - 30% off, NH Hotels Official Site
No i don't work for NH but maybe i should.