Great place to stay and Ewout was a wonderful host. Very quick to respond to questions when we had them. The house was cozy and perfect for four people during our week-long vacation in Amsterdam. The stairs are Dutch (i.e. - very steep) but very manageable so don't be afraid of them. We had someone as young as six and another as old as 65 who didn't have any problems with the stairs. The location of the place was very convenient and within walking distance of most of Amsterdam; you can easily jump onto public transit from right outside.
The automatic espresso machine was perfect for morning coffee. Having a washing machine in the apartment was very convenient; you will have to hang dry your clothes but we found they dried quickly. Grocery store was just around the corner so easy to purchase a few items to keep at home - Ewout left reusable bags out so don't forget to take those with you!