This apartment is in a great location if you're a fan of Notting Hill its a treat. Very close to the tube station (very quick access to all of London via tube), and a lot of eating options around.
The street is pretty quiet and does not have much local traffic, except the street lights that do come in a little and an occasional people talking outside there was no outside noise.
Feeling this is more of a personal issue of being a light sleeper I did wake up a couple of times due to noise in the building (people walking in and out at night), my kid slept with no trouble.
Billie was extremely patient and helpful with our many questions - fast and positive responses to everything - a helpful and dedicated host like that is not easy to find and we really apriciated the help.