Lauren was an excellent guide. She was erudite and clearly and concisely relayed the ideological, philosophical and political underpinnings of the contrasting architecture of the Communist era and modern era in Berlin. She was fluent in both the facts and the concepts, but her knowledge was broad. Hers was not a single layered, memorized script. Her voice was pleasant and she was good humored. For me a bonus was being introduced to the Metro system as we went from the East to the West, though she did give me the option of calling an Uber or taxi. She arrived via a heavy bicycle but managed it well on the stairs and escalators of the Metro. In short, I learned a lot and enjoyed the tour experience.