We stayed at the Hidden House for 2 nights over a weekend in early April, 2019, with two grandchildren. We slept upstairs on the master bed, the children slept downstairs on the sofa which opens up into a bed. The apartment is very small, but has everything you need, and is in a good location in Central Amsterdam. There is a toilet and sink downstairs and the shower is upstairs. There is a small kitchenette downstairs, with a microwave, kettle and small fridge. The stairs are very steep and narrow but there is a banister part of the way up, and handles in various locations which help when going up or down, but this would not be appropriate for people who are disabled in any way or have trouble walking.
Most importantly, I wanted to say that Renee's and Martin's hospitality was outstanding and went far beyond our expectations!