If you want to stay on a houseboat in the center of the city, a 2- to 30-minute walk from anything you'd want to be doing in Amsterdam, in an efficiently-sized but completely comfortable houseboat apartment with the water at your window, I can't imagine doing better than Rinze's place for the location and price. He's very friendly and helpful in any phase of your trip you might need him for. At the same time, you feel like you have your space and time to yourself. Would stay here again in a heartbeat.