Sophie was a great host. Even though we couldn't meet personally she organised everything well before our arrival. She was very responsive, answered our mails within a day.
The location of this flat is just great, less than 10 minutes walk from the train station which is another 10 minutes from central London (either Waterloo or Victoria).
The neighbor is full of shops, restaurants, pubs. That also means that it is not the most quiet part of the city (also, there is an ambulance station just on the opposite side of the street), so expect some noise before 10 p.m. but things are quiet during the night, we slept quite well.
The flat is bigger than I expected based on the photos: a quite big kitchen+sitting room on the first floor plus two double bedrooms and a bathroom on the second. Plenty of space for 4 people. And it's really nice, the whole place is cosy, stylish and clean.
So we had a great time here, thanks for everything!