I'm the other half who have stayed at Katherine's place. Everything is as expected, if not better. My partner regards this as the best Airbnb/flat he has stayed over the past few years. My partner enjoyed the local bar/cafe just a stone throw away from the flat. I love the bed, which isn't too soft and good for my recently-operated-spine.
Tl/DR: Highly recommended, we would love to stay there again next time we go back to London. Thanks again for hosting us.