Camden Town-Gypsies, Tramps and Thieves
If you get on the Northern Line train at Goodge Street and take it four stops North, you'll end up in one of the coolest places London has to offer. Camden Town is an alternative little borough known for its music scene and markets. In my mind, you really can't go wrong with that combination, but if you need more convincing you can see the operational locks, get a a henna tattoo or a real tattoo, walk on streets that look Diagon Alley of Harry Potter fame, and for about two quid eat a meal while walking that will top most of your typical, pretentious, sit-down places in central London.
If you talk to a certain "caliber" of tourist you might hear that Camden Town is full of gypsies, tramps, and thieves. You might hear that it's rough around the edges and that it's a good place...