Anyone who has been to Berlin knows that one of its main characteristics is its incredibly wide streets. This feature makes cycling in the city a breeze. Riders actually have space here; they are not confined to narrow bike lanes that double as a place for parking cars. Dedicated bike paths are off-limits even to pedestrians.
The sheer amount of room to pedal makes Berlin arguably one of the safest cities for cyclists in the world. There are even laws (and fines for breaking them) that are meant to increase safety and responsible among cyclists. Berlin is also quite flat, so tourists can cruise around the 400 miles of bike paths and get to all the city's best sights and attractions without breaking a sweat.