The location is hard to beat -- a beautiful view (as advertised) of the boats at St Katherine Dock, plus the Shard and Tower Bridge. Easy walks to public transportation (bus, tube, and DLR), the Thames, the Tower and Tower Bridge. I liked how easy it was to get to everything in central London without being in the middle of the bustle. It's also very convenient to the interesting, less touristed neighborhoods of Wapping, Shadwell, and Limehouse. The flat is in a secure building and the area feels very safe. There's a well-equipped kitchen and a full-size Waitrose grocery store right across the street.
Check-in and check-out went very smoothly. Simon's co-host David met me when I arrived and was easy to communicate with throughout the stay. I would definitely consider staying here again the next time I'm in London.