We chose the "Cold War" tour of Berlin with Nadav on our last day in Berlin. He was able to modify the tour to avoid some areas that we had already seen (but in retrospect it would have been fine if we went as we probably would have learned more about the sites from him.) The tour started on time, he gave a great overview of the time period and was able to answer our question. He gave us some great tips for visiting - especially the Panoramic view of Berlin.
TOUR GUIDE RESPONSE: Thank You Mac , it was also a pleasure to give you the tour, you were very curious and attentive something that enabled me even to go further into history and the content of the tour! Come to visit again (: