Not the most exciting place inside, but a lovely rooftop area which not all that many people seem to know about, 2 mins walk from Old St station. If it’s packed then The Red Lion is just up the road.
By far the best bagels in London, they are open 24 hours and being just down the road from my flat a bit too local. It is run by a man called Mr Sammy, who doesn't muck about with portion size. It is well worth a visit especially for their smoked salmon and cream cheese speciality.
It is one of the most important business centres in London. Crowded of suits at daytime, perfectly deserted at night. It is so striking relaxing to walk in there enjoying the silence and the lights! It makes you feel pleasantly far from reality.