We chose this hotel for its location and availability; I was in town for a major convention and we booked late, so many of the prime properties in Amsterdam were either unavailable or ridiculously expensive. The location is convenient for getting to and from the airport and anyplace else the trams go, though the entrance to the hotel is at the far end of the building from the Central Station. During the day this is no problem because you can enter through the Starbucks at the near end of the building, but at night in the rain it's a pain. The other downside is that you've got a bit of a hike past the construction for the new Metro line and across the bridge to get to any of the downtown restaurants or shops. Again, not a problem on a nice day, but with Amsterdam's frequent showers it can get old quickly.
The rooms are decent but small by American standards. Ours overlooked the tracks and the harbor. I like trains, so that was no problem, but the windows in the rooms on this side of the hotel have an extra layer of glazing for noise reduction and as a consequence don't open. The ones on the city side of the hotel have operable windows. If you book, make sure you aren't assigned a room on the courtyard; it's no more than ten meters wide, so you have no privacy and no scenery.
We did not visit either the restaurant or the top floor bar; we though they were both overpriced. We did visit the lobby bar for breakfast, which was a bargain for a hotel. Two cups of tea and two pain au chocolat set us back less than 10 Euros. Another alternative is the Starbucks on the ground floor.
The staff, particularly the front desk staff and the concierge, were wonderful, dealing quickly with minor issues and providing excellent restaurant recommendations. After you book you will be contacted by the Operations Manager, who will address any requests you may have, such as early check-in or specific room location. However, you won't hear from her during your visit (at least, we didn't). This was not a problem because the front desk and housekeeping staff dealt with everything.
We were pleasantly surprised to discover that the water in the minibar was complimentary and that complimentary water and fruit were available in two large glass vases at the front desk. This became a daily stop on our way out to see the sights or when heading for the RAI.
To sum up, this is a very good property, and can be excellent if you get one of the prime rooms with a city view. The location, however, leaves something to be desired unless you need ready access to the Central Station or trams and you don't care about being close to the action.