We stayed at Klaas´ house for four days and had a wonderful time in Amsterdam. He and his son Marcel made us feel very welcomed - Klaas gave us a lot of information (map of Amsterdam, sights, tram timetable etc.).
There is a supermarket nearby and the tram station is just a short walk away. It´s about 30 minutes to the city, but you dont have to change trams.
Just a note for elderly persons: the double bed is really soft. We had no problems, but I think my parents would;-) And there is a steep staircase - that might be a problem for older people.
I would recommend the place!