Harms place is comfortable and in a great spot. No more than a 30 minute walk to the central train station for tours and for the boat tours. We took this walk several times and it was very scenic and easy. Plenty of shops and restaurants everywhere if you walk 15-20 minutes.
You have access to a private bathroom and kitchen. Very comfortable bed. We only saw Harm twice, but he was very friendly and on hand if you needed anything. Plenty of places to eat locally and a supermarket (Lidl) close by too. Amsterdam is very expensive to eat out so having access to a kitchen was helpful. The stairs were a challenge with luggage so don’t pack anything heavy, but this is Amsterdam and if you want the full charm and tradition of your stay then you need to overlook this.
Bus stop from airport (397), stops only a 2-3 minute walk from the apartment.
Overall a lovely place in a great location. Harm was very helpful and we loved our stay.