We totally recommend this place!
The room is very comfortable, well equipped and private. Bath is also great. Even though it's not in downtown it's very easy to get around the city (many options, also London's public transportation is very good). There is a minimarket right next to the flat, also many restaurants, pharmacy, shops.
I must note that trains pass near, so there's a bit of noise, nevertheless we slept perfectly well during our whole stay.
Juli and Rei are extremely kind, always willing to help. Really made us feel comfortable.
Definitely one of our best Airbnb experiences.