Very central location, 2 mins walking distance to Natural History Museum, 5-8 mins to Hyde Park. Alex and his family are very nice and they have a lovely cute dog called Lucky! Enjoyed my stay here. Although it's a small space, I'm out most of the time so it doesn't bother me at all. Just a small tip, you need 45mins for the heater to work to take a hot shower.
South Kensington is an expensive area. I'm glad that I found this place to stay in London!