My partner and I stayed here for 5 nights, after trawling the internet for a reasonable hotel near the centre of Amsterdam. We chose the Nicolaas Witsen Hotel which from the map, looked a little further out than we wanted, but looked nice and a reasonable price.
We soon realised after arriving, the Hotel was in a perfect location. Short walk to restaurants and cafe's, quiet and trendy area, across the canal from a supermarket and a stone's throw from the tram.
The staff were SO nice and friendly! Always happy to help, the lovely lady at reception let us use the phone when we thought my partners mobile phone had been stolen, pointed out the local police station too (we found the phone, we'd left it at a restaurant!)
The only things that the hotel lacked was air con (during two nights it was around 30 degrees celsius) and on one night we could hear the people above quite clearly.
Overall, the hotel is very reasonably priced, great location, lovely staff and very clean, the breakfast was great too. Would definitely stay here again