I liked this museum very much. The cashier was very friendly and she informed me about the different kinds of discounts (even if there was a chart just next to her). Make sure you bring your national professional ID if you're an EU teacher or you work in health care as there are discounts (free for teachers!).
I was the only Hungarian in the group, and the guides asked me three times if I was sure about not wanting a Hungarian guide. I found this very professional, as they could have just ignored me (especially because - being a teacher- I did not pay a single forint .)
First, we saw a short (6-7 mins) film about the history of the hospital. Then we were led to the cave system underground. They provide you with coats as the caves are a bit cold. (I liked the idea that they used special coats still worn by nurses and doctors in some hospitals in cold weather.)
The guide, Gerda was very informative and told us lots of interesting little stories. I was very well informed on the tour, but it still was't too much, just the right amount of information. The hospital was a very unique experience with its 1 km underground system. I saw different treatment rooms, an operation theatre, kitchen, wards and the machinery rooms. As the hospital used to be a top secret location, the stories about disguising functions of the hospital are fascinating.
Yes, some visitors did sound the siren, but we were asked before if there was anybody who did not want to hear it.
The tour guide took a photo of the visitors which can be seen on their website.
The only downside was that the tour was a bit rushed, I wanted to read the posters, but there was no time.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.