The Klementinum Library was on my must-do list, so for me the tour was great value for money being only $10. The library was beautiful, but could only be viewed through the many doors, you were not allowed to enter the room or view it from any other point, so items of interest were quit far away and difficult to view. The astronomical tower provided a great view of the surrounding city landscape, it wasn't overcrowded due to time-limited tour numbers. The tour guide was knowledgeable, however I would say a bit unassertive. A young child (~3 y/o) was extremely noisy and disruptive to the tour, to the point no one could hear the guide for the first 10 minutes. It took majority of the other tour participants (15+ people) to request the parents to quieten their child before the guide stepped in and requested the same, even though she had to pause multiple times during her talks. I'd put it down to a bit young or inexperienced. Not a place to bring children unless they are truly interested.

Well worth a visit if you are interested in astronomy. Library is beautiful to see, understandable why we only get a look through a door at it. Beautiful sights of Prague from top of the tower. Guide very informative and had great English. Good value fir the hours tour.

This was one of my favorite tours in Prague. Our guide was very informative and patient with our group. She answered questions and explained the history of Klementinum. And the walk to the top of the tower and the view are simply amazing. Highly recommend to those who love love libraries, books, and learning about precise time.