eh, I lived in Hackey (just off "Murder Mile"!) for the first few months I lived in London, and it really wasn't that bad. Good bus links, and I could walk to a bunch of shops, a club, theatre, library, and a leisure centre and people were friendly. The most threatened I ever felt was getting some cat calls whenever wearing my red trousers (er, okay?) so I don't count that as bad at all.
But even I wouldn't live in Elephant & Castle or Kentish Town (the latter used to be ok 5 years ago, but <i>dear god</i> not anymore...)!