I had a great stay in Reinhart's garden house.
I liked the central yet quiet location: 5 minutes from a free 24/7 ferry that takes to to the central station.
Reinhart is super nice and always responded immediately, made sure I had everything I needed.
Everything was clean, size was fine for one person.
You can use a garden in central Amsterdam! :)
Some downsides:
The house is kind of drafty, possibly too much for winter (even though there are heating devices everywhere)
Spiders seem to like it as well 😬