Staying with Charlotte is all you could wish and even more! I was a bit nervous as this was my first experience with airbnb and I was alone, but after meeting Charlotte in the very first evening I've realized that it was absolutely right decision. The room is tiny, but very cosy and, though it is not seen on the picture, there was a window in the room. Personal bathroom is, of course, great plus, for me it was mandatory and It satisfied all my needs. Charlotte takes care of you - you would never get it in any hotel: always talking to you and happy to discuss your plans and experience, advise something if you need. Hot tea, some fruit, sweets and breakfast food are ready for you. I really felt myself home and this home was convenient, beautiful and cosy.
Location: great, very central without crowds and safe.
Airport tip: you'd better come to Victoria from the airport, with luggage it is easier to take picadilly line, change to district line at baron's court or hammersmith (just come out of the train and wait for the district one at the same platform). when out, just follow Charlotte's instructions attached to the booking. Otherwise (if go to Pimlico) you should change from picadilly to victoria line, that is with all the stairs etc...
Сleanness: perfect.
Heating: perfect (and electrical blanket is my love).
Sleep quality: perfect (though the kitchen it above your bedroom, but even if you are still asleep in the morning, nobody would dance there).