This is a good place to stay: the listing and the reviews are accurate - Wilbert is a friendly, helpful and interesting host and the room is well equipped, spacious and comfortable. There are 4 flights of steep, narrow stairs to climb, but Wilbert gives a hand with the bags; the shower is really good; the toilet is just outside the room and shared with Wilbert's other guest room.
The location is excellent, quiet but only a few minutes from a tram line to the centre and a short walk from the Vondel Park, major museums and the concert hall. Plenty of shops and cafes nearby.