I stayed here a couple of times over the last couple of weeks. If you're in Amsterdam to see the sights then this is not the hotel for you as it's not near the centre at all.
The hotel does operates a free shuttle bus from the airport which is really useful. Checking in was good and the rooms are very clean and well decorated. No problems at all. They also provide Amsterdam tourism magazines.
The beds are seriously big - in both the rooms I stayed in the "double" bed was approx 6.5 feet wide. Shame they only had blankets (I'm a duvet fan).....
If you're looking for a hotel close to either IBM or Mexx then this is the one.