Bar Italia, W1D 4RP
The definitive coffee bar; the Bar Italia has been serving coffee to the denizens and revellers of Soho since 1949. It's tiny, it sells good coffee, it's open all night - that's pretty much what you need to know. Oh, and they do paninis, pastries, etc, which are also pretty good. A very useful place to know about at the end of a night out in town.