I spent two days in the captain's quarters aboard the Grietje. The hosts were responsive and friendly in person so I felt welcome the second I boarded. I had that portion of the ship all to myself. The room was spotless and very comfortable. The water was very calm and the docks were quiet so it was peaceful and easy to sleep without disruptions. I'd highly recommend a stay aboard the Grietje since it's part of the Amsterdam lifestyle and an experience worth trying if you've never stayed aboard a ship.
Sam