I stayed here after a brutal week of business travel in the south of Holland, this hotel was a wonderful surprise. My company booked me here on very short notice, and I got a 5th floor room that was flooded in sunlight and had a panoramic view of the Amsterdam skyline (#501). The decor is subdued and comfortable, and the deco style (with many original details) of the building is great and different in teh middle of all the 17th century architecture. It's also the best-smelling bathroom I have ever experienced in a hotel- fresh and kind of citrussy (Not usually something you think about in a hotel but it was really noticeable here).
Breakfast was decent, with a discount if you requested it on check-in. The homemade bread full of seeds was particularly good, and the yogurt-type stuff for fruit was great too.
The place was very clean, comfortable, and I had no problems with noise. The ONLY caveat I would mention is that I had a non-smoking room but there was a smoking place just one meter outside the door, so sometimes it seeped through under the door. Otherwise I loved it and would definitely stay there again if I went back. Also, the airport shuttle was a great worry-free way to get home.