Ruud and his cohost Diogo are really friendly, efficient and helpful. We didn't need to trouble them whilst we were in Amsterdam but I felt they would have sorted anything out for us if asked.
The apartment is small and up 4 flights of narrow stairs but we knew that and is was perfect for a few days. It had everything we needed and the patio was really welcome as the weather was hot.
It is in a great location.Close to the main sites/museums ie 10 min walk but away from feeling like a tourist. Numerous restaurants/bars around the corner. We ate some great food. Its difficult to know what gives a place a great vibe but Amsterdam, and where we stayed, has got it. Jan and Jerry