The flat is located in a very nice neighbourhood and everything you need is in comfortable walking distance. The flat offers more than just the standards you'd possibly expect from a shared vacation home: a functional kitchenette, good WiFi (even a printer), quite a big bathroom (which was a pleasant surprise), a cozy double-bed and a nice sitting room where you can kick back and end your day with a good (or crappy) book or some TV (there's even a DVD-Player!). Clare's description of the flat was honest and accurate.
Some guests complained about the narrow staircases and the problems with getting their luggage into the flat. Hey, you're up to renting a "rooftop nest"…of course there're stairs. But if you have strong enough arms to carry your bags (and maybe a sufficient vocabulary of curse words), you really should be fine, don't worry.
And Clare herself might be the perfect Airbnb host: She was always reachable, nice and helpful and she even gave us lots of contact-numbers for cases of emergency. We felt very well cared for!
So: I won't search for another place for our next stay London. Great place, great host…go for it!