Berlin is one of the most famous cities in the world. You can see a lot of historical places such as the Deutsches Historisches Museum, Treptower Park, and the Berlin TV Tower. If you’re a first-time traveler, visiting a new place might be a little bit intimidating. Here are the four tips for travelers to make your stay hassle-free.  1. Opt for Berlin airport transfers By opting for a Berlin airp…