Having been to Amsterdam many times, I somehow managed to never know of this little gem. This time I discovered it and the visit really made this visit to Amsterdam among my most memorable. The building (and the church) is over 350 years old. Even the staircases are original. The main draw is to see the Catholic Church occupying the top 3 floors of 3 adjacent buildings, and it was used for nearly 250 years until, in the late 1800's a large Catholic Church was built nearby. The church, no longer in routine use for the last 100 years, was one of many "out of site" Catholic Churches which were tolerated as long as they could not be "seen". The church seated hundreds, and over the years well over a million people climbed the steep stairs to attend. In fact, the wooden stairs have been worn down by 1 cm. Much of the building (really 3) is well preserved from various periods of the last 350+ years. If you have even been to the Lower East Side Tenement Museum in New York City, this is similar in that it shows the way of life of the people (albeit without the stories of the family that lived in the house). The audio guide (free with entrance) is terrific. Just enough information, with great supplemental material.
Do check this out, and after go 1 block away from the Canal towards the Hotel Krasnikovsky, and delight in a gelato.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.