It´s the best way to know Berlin if you come on summer.
You can choose between rent a DB-bike (Deutsche Bahn is the railway in Germany) with the sistem Call-a-bike, it costs 8 cents per minute, a maximum of 15 € for one day or 60€ a week. And also there is lot of shops where you can rent a bike, the cheapest one is Orange Bikes (Kollwitzstrasse 35, Prenzlauerberg) 6 €/day.
But you can also rent a Velotaxi, a high-tech vehicle, always close to the most popular tourist places.
