It was surprisingly awesome! A little hidden gem in Prague :) It was only the 5 of us who went there, and we couldn't speak czech, plus a czech guy, and our tour guide was so awesome that he held the tour in both czech and english for us. I cannot guarantee that the same will happen with everyone, but we had a really great experience here. The tour itself is also very interesting, especially if you like old industrial plants. We even went on a little boat ride underground, and walked through the old sewers. It was really awesome.