We had originally booked one day with Katrin to tour the castle and surrounding areas of Prague, but after learning so much from Katrin about prague that first day, and having so much fun with her, we booked a second day to tour the Old Town. She is very knowledgeable about all the areas of Prague and you will really get a great history lesson.
You will also have fun which is not always the case with tour guides. We highly recommend Katrin as well as Kristian, who coordinated the tour for us. They are knowledgeable and fun and the best way to tour Prague!