Berlin is one of the cities that I visited last summer. Actually, my trip around Europe started there. Berlin is capital city of Germany, and one of the friendliest and the most opened city in Europe. Also, people are very kind and ready to help you in every situation. 
I found Amstel Hostel in Moabit district, which is about 15 min walk from the Berlins Hauptbahnhof (Central Train Station). There are a lot of things to visit in Berlin like famous Brandenburg Gate: 
or The Holocaust Memorial Center 
or Victory Column and DDR Museum
I highly recommend you to walk around a city as much as you can, because it is the best way to meet a city, but if you want to get to very quick from the point A to the point B, you can use S Bahn and U Bahn, which work very good. In the end, there are a lot of bridges on the Spree river, so you can enjoy you view from there.
