I stayed in Matthijs's house for three nights, along with my daughter. The location is great, central, just a few minutes walk from station, metro, tram, Dam Square and the beautiful canal area. The area is very lively in the evening, but the side street where the house is located is absolutely quiet and peaceful. The breakfast in a nice bakery on a canal just a few steps away is very good, both sweet and savory. Another plus are the bicycles, available to guests, even if they are the typical Dutch bikes with foot brake: if you are not used to it (like us) they are a bit stressful to ride in the Amsterdam bike traffic.
The room is small, but equipped with everything you need, very clean. The bed is so comfortable that I forgot to ask Mat what kind of mattress it is used, I want it also at home.
Last but not least, Mat is a truly hospitable person, available to give advice on itineraries, places to see and places to dine. Highly recommened.