I can't recommend this Air B&B enough. Liz was a great communicator and stayed late to help us check in. Her flat is a modern minimalist paradise. Furthermore, it's spotlessly clean and fully stocked with snacks and toiletries.
Conveniently, it's right down the street from a bus stop which can take you to the center of town. There's not an underground station within close waking distance though.
If we're in London again we would stay here in a heartbeat.