We had a really great WE at Heins Place. It is tiny but has all what you need. It is clean and the area is quiet and central. There are Restaurants and Bars around the corner - also the Supermarkt is around 5min walking distance.
Hein is a really great Host. He gave us some really nice Amsterdam inside tips :)
The Appartement is in a great location-you can walk from there to all sightseeing points of Amsterdam. Hein offers also bikes to rent (for a fair price).