Location is a bit far from London Heathrow airport (1.5hrs), but even though it's not in the "city centre", it's worth it for the money you save. The building is close to public transportation and restaurants and is very quiet and clean. Josephine is super friendly and helpful. Although the bedroom is quite simple, it had the comfiest bed I've ever seen at an Air B&B. Bathroom is clean and spacious. Check-in was done with a key in a door box. Once you get used to the idea (ie. with other Air B&B), it is super easy and practical.
Overall, I would definitely recommend this place to others and stay here again in the future myself!