Spent a week here and, in general, found it very good. I had an executive double room on the third floor with views over the canal. Some have commented on traffic noise which, while it was audible, didn't disturb my sleep at all - guess you should expect some noise in a hotel on a main street. I didn't take breakfast which again, some have complained as being expensive, but I guess it depends on what sort of room rate you managed to get and whether the overall package was therefore still reasonable.
The location for me was perfect with the Rijksmuseum almost on the doorstep, and Van Gogh musuem 5-10 minutes walk. 5 minutes took you into the Leidseplein and from there access to most of the places to visit in the centre of town. In fact, I walked almost everywhere despite the city's excellent tram service, largely by planning what I wanted to do, leaving only 10-15 minutes walk between destinations, taking in the excellent canal views en route.
My only gripe was the lack of free wifi in the rooms - it is free in the lobby but I didn't try it there. Again, it's maybe a matter of weighing up the whole package cost - they charged 10e for 24hours availability which does seem heavy. I mentioned that in the comment card I left, and received an email a few days later from the manager explaining that they were tied (my inference) into a current deal with a network supplier, but that they would be looking at free wifi in the near future. As I said in my comments, I'd guess travellers are more likely to appreciate the availability of wifi to help plan their stay, checking places to eat, get directions etc than they are these days watching the TV which is a free facility in hotels.
Minor wifi gripe apart, I'd happily go back when next I'm in Amsterdam.