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.
As a keen runner, running through Greenwich Park and on to the river side I see the Thames Barrier, which is not only the worlds second-largest movable flood barrier (after the Oosterscheldekering in the Netherlands) but is also an iconic site on what is fast becoming a recognised stretch for developers including the 02 and Ravensbourne College of Design and Communication.
Relaxed with character. Tiny garden at the back overlooked by Waterloo train station. Not sure if mother cat still lives there. Nice to go with friends or alone. Books. Good for a coffee and cake or a bottle of beer. Spiral staircase down to basement. One loo serves the place - tip - lock the door, don't just rely on the curtain and save an awkward encounter.
Photo credit: http://www.appletoothpaste.co.uk/2017/05/coffee-scooter-caffe-london.html
Great selection of books and magazine with a big focus on rare. out-of-print books Japanese photography. Can sends hours in this little shop. I'd try to avoid on Market day (Saturday) if you want to have a good look as it can get a bit busy for such a small space.