We spent two nights at Sonjas marvelous Houseboat. Sonja provided detailed how-to-get-there information upfront and it is only three bus stations drive from the central station. Best on arrival was that we have been welcomed with a full fridge for a first brunch including white wine.
The boat is located in a former industrial neighborhood which has great charm, is more silent and also not so "shaky" than in the typical Grachten boats. You can use two bikes to explore the city for free which is marvelous and we really appreciated that service.
The studio apartment is small due to the limited size on the boat but the design is really appealing. The interior of the complete boat is very design driven.
Best part is to have a swim in the morning, which is very cold but so refreshing.
I recommend to plan your Amsterdam stay on Sonjas boat and I will hopefully have the pleasure to spend some more nights on the Tasmania.