Who has already been at least once to Berlin can come back with a special guide. Berlin is a very large city and full of things to see, attractions and clubs, but even if you were in the German city for months you would not be able to see things that a real German knows.
Some guys have therefore made gods alternative routes that no guide can describe, these guides are now 32 and offer tours that talk about art and really alternative places in a city that has so much to offer. L'Alternative Berlin Tour leaves every day at 11 in the morning from Alexander Platz. The tours are different and all deal with a different theme as they travel the length and breadth of the city.
Il Free tour it is very unusual because it shows the symbolic places of Berlin and in the end it is possible to pay the guide the price we think is fairer for its performance. This is the tour that I suggest because it leaves 3 times a day, every day, at 11, at 13 and at 15, and as mentioned the tour is free, at least at the beginning, because you will decide at the end how much it is worth. Among other tours is the Twilight Tour, People's History Tour, Football Tour, the Street Art Workshop to try to do street graffiti together, the Tank Driving and many others.
Aside from the free tour everyone else has a affordable price ranging from 5 to 10 euros per person, very little compared to the cultural and human baggage that you will take home.