We had a summer family stay for two nights and can fully recommend Martin as a host. Very flexible and helpful.
The houseboat is cozy, unique, trendy in it's own retro way and it is located in a fantastic spot. So that also comes highly recommended.
Two little cautions: the path to the entrance is narrow and perhaps a big ask for small kids on their. Also, we stayed on very hot days where the interior climate on the boat was somewhat damp even with the all windows open.
But if you want to make your CPH stay 100% unique and easy, this is a rental to consider.