Diewert was a very nice person. Right when we arrived he Managed his time to meet us. The boathouse is like you see in the fotos. Everything was very clean. The houseboat is in a very quiet neighbourhood and about 2km I guess away from the city Centre. You got 5 miniutes Walk away a coffeshop, supermarket and 2 bus/train Station which connects you to the centraal station. Otherwise if you walk to the centre you would be in about 20-30 minutes there ... But we got lost a few times walking to the inner City because we didn't had a clue about the way and structures of Amsterdam.
So I really recommend Diewert and his houseboat.
Kind Regards