First and foremost find another tour company. I was saddled with these people by Viator for a tour of Potsdam. First, no tour guide. Second, crummy headsets that did not work, third, the bus creaked constantly, and last we got left in a driving rain in Potsdam and got soaked. We had to find our way back. When we got off the bus the non communicating bus driver pointed at a time on a card and I specifically asked if the pickup was at the drop off point. He said yes. Never showed up and we waited in a rainstorm of biblical proportions. Really crummy tour company. Stay away.
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