Beatrix is a very kind, responsive and helpful host. Even though everything was provided as it was stated in the listing, if I needed anything on top of that it was promptly taken care of. She also messages you to ask if everything is okay, which I found to be quite considerate.
The flat is small and cosy and is suitable for a short- or long-term stay for one person. The bed is comfortable. Linens, towels, etc. were provided. Kitchen and bathroom are clean with all basic things provided. The area is quieter than anywhere else I have stayed in London (of course it was not quiet per German standard but that's something one has to bear with in London I think). Underground, overground and National Rail stations are all quite close by, so are groceries and restaurants. Neighbourhood is also friendly and safe for a woman staying alone.
In short, a very comfortable and safe place to stay at. I recommend this place and would like to stay here if I visit London again.