As a group of 16 people, we enjoyed an awesome Amsterdam weekend on the ship. Everything was as described. The common room is really large and the kitchen is very well equipped. The sleeping cabins are not exactly huge, but sufficient and clean.
Skipper Arse and the crew were nice, friendly and uncomplicated.
The location at Sumatrakade is at about 30 minutes walking distance from the central station, but with bus line 48 you get there quickly.