"I cannot begin to express how amazing this tour was. One would think 4 hours would get a little long, but, by the end, I was hoping for four more hours. Josh is extremely knowledgeable, not only of Cold War Berlin but of just about everything that was going on in Europe. He seems to have a passion for history, and it shone through. There were only four of us on the tour, and so we peppered him with questions (poor Josh!), but he answered them all. He knew numbers and stats and dates. It was just amazing.
I would take another tour with Insider Tour, and Josh specifically, again. It was such an illuminating tour and, if you are going to do it, make sure it's at the beginning of your trip. You learn a lot, and there will be things that you see or hear that you'll want to have time to explore later."