Jacqueline's flat is located very conveniently in the Kensington/Chelsea area, at a walking distance to the Olympia exhibition centre, in a residential neighborhood. The area felt perfectly safe also at night.
Jaqueline is a very nice and helpful host, the garden flat room is small but has everything you need, very clean, and it has its own quite spacious bathroom.
As it's a basement flat, you get quite a bit of noise from people walking in the street in the morning, so if you're a light sleeper and not an early riser yourself, you might want to bring earplugs.
I'd book this room again as it's very conveniently located and very comfortable.