Best possible location!
My husband and I walked around pretty much all of what might be called "metropolitan" or "downtown" Amsterdam, including a jaunt to an outlying brewery in an industrial location. Our conclusion was that Maarten's apartment was, for us, the spot on ideal location. Other neighborhoods were perhaps more opulent, with sexy canal views, but the De Pijp area with its many small shops, bars and restaurants was a delight every day. Icing on the cake was the Albert Cuypmarkt just around the corner, source of top notch provisions for the many meals we opted to cook at our home away from home. In addition, the apartment is a very walkable distance to the museum quarter. We purchased Museum Cards which allowed to visit multiple museums as often as we pleased, without feeling that we had to "see it all" in a single day, which would have been impossible anyway given the scope of many collections.
Communication with Maarten was timely and friendly, and the apartment clean and efficient.