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By all accounts, Berlin is among the safest and most tolerant of European cities. Walking alone at night is not usually dangerous although there's always safety in numbers.
Despite some bad press, racial attacks are quite rare in Berlin. Having said that, although people of any skin colour are usually safe in central districts, prejudice toward 'foreign-looking people', especially non-whites, is more likely to rear its ugly head in the outlying eastern districts such as Marzahn, Hohenschönhausen and Lichtenberg. These areas are scarred by unemployment and post-reunification depression. No matter the colour of your skin, if you see any 'white skins' (skinheads wearing jackboots with white boot laces), run the other way - and fast.
Drugs should be avoided for obvious reasons, but particularly because a lot of the stuff is distributed by Mafia-like organisations and is often dangerously impure.
Most U-/S-Bahn stations are equipped with electronic information and emergency devices labelled 'SOS/Notruf/Information' and are indicated by a large red button. If you require emergency assistance, simply push the 'SOS' button. The information button allows you to speak directly with the stationmaster.
