I would advise acquaintance with Berlin to start with a bus tour of the city.
The ticket price is 20 euros. Buses depart every 10 minutes, starting from 9 am and up to 18 hours.
We sat down on the bus at the first stop that near the water bowl
Throughout your route, the bus makes 18 stops where you can exit any stop and then continue the route next bus. Turning on the headphones (button with number 8), you can listen to an excursion in Russian.
I was in Berlin at times when I was GDR and now returned from there a few weeks ago. Honestly, it seemed to me that the city did not change at all. Only numerous sculptures appeared, symbolizing the fall of the walls and the combination of Germany.
That's what you need to look at, it is Friedrichstadtpalast. Getting very easy, as the subway goes straight to the place.
This show is considered the most ambitious of all such ideas. The troupe is not toured, as it is not possible to transport and decorate and equipment. Therefore, the only place where you can see the show is in Berlin. Tickets are better to buy in advance on their website. You can choose places (the price is serious) and print tickets with confirmation from the computer. This is quite enough and change the ticket at the box office is no longer necessary.