We visited Amsterdam in April 2009 and stayed in this apartment, there were 4 adults in our group and all of us loved staying here. The views of the harbour are fantastic and the location of the apartment is ideal, it is only a short walk from Central Station and is within easy walking distance of Dam Square and the Red Light District.
The apartment is very well equipped and was spotlessly clean. The owner/manager was very helpful and even offered us a place to store our luggage on the last day of our stay (we had an evening flight and obviously didn't want to carry it with us all day after vacating the apartment).
We were concerned about having to leave a cash security deposit but need not have been as there were no problems with this being returned to us at the end of our stay.
I would defiantely book this apartment again and would highly recommend it.