My wife and I had an Architecture tour with Karin on October 28. She is a genuinely warm person who makes you feel comfortable immediately. Karin communicated with us by email a number of times before we arrived in Berlin. She has a masterful knowledge of not only the Architecture of Berlin but of the history of the buildings intertwined with their individual history. She went out of her way to adjust the tour so that we could have a short visit to a place we wanted to go. We also visited some areas that she thought we would enjoy that were not part of the original itinerary. The ability to have a driver/guide service was an excellent experience and I highly recommend Karin.