Reading about this attraction doesn't do it justice. You travel back in time to an interesting part of the city's history. There are excellent audio guides in many languages, and knowledgeable staff to answer questions. You can stay as long as you like to observe the different rooms. The floor of the church is covered with amazing woven rush "carpets" which are unique and enhance the sensation of travelling back in time. We had lunch in the cafe; decent priced sandwiches and beer with a view of the canal.
The stairs are very tight and narrow; this is not an accessible attraction or suitable for anyone with mobility issues.