Great hosts! Hans was very helpful, giving us clear directions and making sure someone was there to let us in, give us a key and show us around. He was available if we had any problems or questions but left us to do our own thing.
The building is located on a very busy commercial street, but the apartment was extremely quiet. Great location - lots of stores and activity on the street, but go around the corner and you're on a peaceful, quaint street with beautiful canal views. It's also within walking distance of many tourist sites - Rijksmuseum, Van Gogh Museum, Ann Frank House, etc.
About the apartment itself - it was lovely with a comfortable bed and a sweet little balcony. Be aware that it is up three flights of steep, narrow winding stairs - getting our suitcases up the stairs was a bit of a struggle.
Overall a great stay, great location, and very considerate and helpful hosts.