It's spread out, but the S- and U-Bahns will take you quite far, out past the edges of the city. It's hard for me to imagine needing a car (OK multi-crate Bier

It's spread out, but the S- and U-Bahns will take you quite far, out past the edges of the city. It's hard for me to imagine needing a car (OK multi-crate Bier runs maybe an exception, as another has written, or moving apartments). For real long-distance stuff there's the Regional Express and normal long-haul train service. As to walkability, I'm a dedicated walker and the city's fantastic for it. Sidewalks are quite wide (by US standards) and there are usually plenty of safe places to cross streets, legally and otherwise. Mind the Ampelmännchen and you probably won't even get hit by a trolley.