Ignore them, they are just wrong (In fact make a note to ignore all other reviews they do). Do not be put off by the fact that this is a church, if that is not your thing - this is a building like no other i have been in - it stuns in a whisper. Plan your trip to Vienna to fit this place in, you can go to other places most times.
Check the openning time, it is very limited - we went on a sunday afternoon via the 48a bus from volkstheatre. Well worth the effort.
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