One of the best ways to get to know a place is to taste simple local food, especially when you have the opportunity to visit street markets and fairs. In Berlin, curry wurst and doner kebab are a symbol of local street food. But fortunately the gastronomic scene has evolved and some markets are proof of that, such as Markthallen.
The important and fundamental thing about Berlin is to be different, bold, to be ahead of time, shocking and out of the box. It is hard to find a "standard" young Berliner. Better yet: their pattern is the type that has no judgment, each individual express himself as he wants in his own way, and the more different the better.