We spent a wonderful time at Henk's place ! We didn't meet Henk personnaly because he was on holidays abroad, but he was available any time by mail and we had a very good communication !
The houseboat is perfect for two people, fully equiped with everything you might need. THe street is full of place where you can park your car for free, which is a very good point! The spot is great in a calm and peaceful place, and we even had the chance to meet Harry the heron :)
There is a food store nearby, you can count 10 min by bike and like 20 min by walk to reach it.
To go to the city center, you can whether rent bikes (it will take approx. 15 to 20 min by bike) or walk and take the subway (30 min. walk), or take a bus and take the subway.
Anyway, if we decide to go back to Amsterdam, we would definitely try to go back to this houseboat again !