Harm is a good host, and he gave us all the directions and suggestions we needed.
The room is located in a tiny apartment in a good zone, near the museums (van Gogh, Rijksmuseum, etc) and the airport bus stop.
Unfortunately, the bathroom is very tiny and lacks a sink, you have to use the kitchen one. That was maybe our greatest delusion. The carpet in the sleeping room should be deep cleaned and also the library, in my advice. There is no place to put clothes, besides a small table with two chairs. As many others guests said, stairs are very steep and carrying big suitcases could be hard., for us that was clear from the comments and wasn't a problem. Furthermore, Harm helped us carrying our luggages up the stairs.
The kitchen was recent and full functional, but we didn't use it because we were strolling around the city all day.