We met the best tour guide, Anja, who explained everything in a humorous and detailed way! It was an English tour (and her English was easy to understand). Although there were no headphones or microphones, the guide would stop at each point and gather everyone around to explain. The tour started at 10:30 AM, with a 30-minute break after 2 hours (that day was Germany's coldest in a century, and Anja took us to a coffee shop to warm up and use the restroom). We disbanded around 3 PM. We constantly weaved through the city, and what seemed like ordinary buildings turned out to be full of historical significance. (It was originally a 4-hour journey, but Anja had so many stories to share that it ran a bit over). After this trip, I understood much more about the city of Berlin. I personally have watched many travel expert videos on YouTube, but actually participating in a tour (with a guide) provided a much deeper experience. I highly recommend this itinerary.