I love CitizenM Amsterdam Airport. It was my first time, I had to catch an early flight and didn't feel like getting out of bed at 4AM at home, so I stayed at the CitizenM.
VERY nice people, VERY nice room, GREAT bed. The automatic check in with the computers work perfectly and hassle-free, but there is someone to help you if you don't understand.
The room was very clean, the bed was really big and I slept like a baby. The mood pad is nice, you can change the lighting and also close the window shutters. The shower is perfect.
Don't sleep here with someone you don't know, BUT there is a curtain so you can't see eachother if you are in the shower.
Breakfast was good.
It was perfect for me and I had a good night's sleep before my early flight. It isn't too cheap, but I think it was worth it.
Only thing I missed: a little fridge or minibar in the room.