Where is it? In East London, running east-west a mile or so from Tower Bridge to Limehouse Basin. If you believe Google Maps, it's called 'Candle St' in the middle.
What’s it like? Well, it's the East End, so it's not much like Mayfair. Cable St is home of one of London's showcase separated cycle lanes: yes, I'm afraid this is about as good as it ever gets in the capital. The street is famous for its role in the anti-fascist demonstrations of the 1930s, commemorated by a striking mural (right).