So much better than a generic hotel, and for much less than London hotel prices. Kat's flat is full of character, full to the brim with quirky decorations, plants and an eclectic selection of books. We enjoyed having a browse through some of them and learning about subjects as diverse as the Great Train Robbery and Somalian mind-altering plants. Kat herself is also a very interesting person and her work sounds fascinating. She was friendly and communicative too.
Even though the bed was in the living room / kitchen, we still felt like we had privacy, and we barely saw Kat for the three days we were there. Actually would have liked to see her more to chat more about her work and travels and interests!
As other reviews have mentioned, the bed is very comfortable, and we still managed to sleep OK despite being there in 40 degree heat on the two hottest days ever recorded in the UK! There is some outside noise (with the window open at least), but it was much quieter than we were expecting for what was described as a "lively" area in the middle of London. Very conveniently located - we like to walk and we just walked to and from central London from the flat, but there are also public transport options close by.