You simply can't ask for a more convenient location, just a few step away from the tube (but you won't hear the tube in the apartment) and the bus stop across the street has several buses every 5 minutes that takes you to Central London or elsewhere.
Portobello market is one block away, Supermarkets just 1 minute walk and you can literally walk to Westfield Mall in 20 minutes. It took me only 45 minutes from Heathrow door to door.
Rosie was very helpful and friendly, you can find everything you need in this cozy apartment and we loved the Turkish restaurant across the street that we were there 2 nights in a roll. I would definitely come back to this apartment for my next visit.