Don't know how unsafe it is, but it is a bit nasty to see the stuff that goes on in U-bahn stations such as Moritzplatz, Kottbusser Tor, Schönleinstraße, Herman

Don't know how unsafe it is, but it is a bit nasty to see the stuff that goes on in U-bahn stations such as Moritzplatz, Kottbusser Tor, Schönleinstraße, Hermannplatz, Leopoldplatz, Boddingstraße et.al. Never felt unsafe, but the heroin usage and dealing is very open and in your face during the commuting hours.