We had a really nice stay at the airbnb of Kamilla. The room was quite small, but since we were out in the city all day this wasn't an issue. The bathrooms and kitchen were nice and clean and had everything we needed. The bed was just long enough for me (a little bit on the short side for my friend) due to the pitched roof. But then, we are Dutch ;) (around 1.70 - 1.75).
The location of the airbnb is great! A short walk from St. Pancras station (where Eurostar arrives) and an even shorter walk to the underground. On walking distance there are nice pubs and restaurants.
Overall, we had a really nice stay and loved London!