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Wow, if I didn't do Heidi's tour, I don't think I would have even a quarter of the appreciation of Berlin that I now do. In fact, I want to move there! I wasn't in Berlin for very long, but I really got a well rounded grasp with Heidi's 3-4 hour walking tour. She is extremely knowledgeable, brings before pictures of buildings, is pretty funny and has the cutest dog. Oh and she also takes bitcoin. I highly, highly recommend.