As we were in the area (just been shopping in nearby Albert Cuyp Market) and has heard of this "must see" camp and kitsch cafe, we popped in for a coffee and cake.
Have to admit that the selection of cakes on the menu was interesting, even amusing, although there seemed to be a lack of variety when it came to ordering. Two selected were gone and one of those we did get was the last piece (not the freshest).
Service was perfunctory, but maybe being there when it was 3/4 empty wasn't conducive to atmosphere and staff motivation.
Not convinced about how clean it was either - sticky tablecover, etc.
However, for a quirky little example of the sort of places Amsterdam offers, worth a look if you are passing by.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.