Website is super easy and simple to book a tour. No need to make an account. Just chose the tour, the language and the date and boom, you get an email confirmation. Our Guide Jan was wonderful. He took us through the brief history of Prague and walked us to Wenceslas Square, Church of Lady of the Snows, Old Town Square, Astronomical Clock, Jewish Quarters and Charles Bridge. Throughout the tour, he kept giving us little nuggets of information which can be really helpful in navigating through Prague. Although the tour is technically free, you are expected to pay something to the guide in the end for his efforts. I can easily recommend this tour to anyone for orienting themselves with the city in 2.5 hours.