Lovely stay at Max and Billie's place! It was very central, and Notting Hill was such a wonderful place to stay. There's a local market (Portobello Road Market), where you can see the famous Notting Hill bookshop, there's also lots of pubs and places to eat. Max and Billie were also great communicators, and I'd definitely stay here again. Just to reiterate what others have said, the flat is at the very top of the building, and there's no lift, so just be sure you can lift your bags up roughly 5+ sets of long stairs.