We had the best time in Martijn's place. We met Roland who helped us with good advices but did not meet Martijn. We had much space as a family of four with 2 daughters (age 8 and 14 ). Both girls liked the boat a lot! It is big and very nice. A very unique way to enjoy Amsterdam. Just staying all day in the boat would be awesome. Much better than any hotel we know in the city.