Bottom line: amazing value for a great price, would strongly recommend to anyone coming to the area.
Good locating- very close to the tube and Portabello road. The area around it a bit boring (in comparison to other, more vibrant London neighborhoods) but that's what you ought to expect when booking a flat in the center of Notting Hill.
The apartment is very functional, small but spacious enough for a couple. Nice kitchen, very easy access and good amnesties. Billie and Max were highly responsive and helpful.
Two small downsides:
1. The mattress was a bit uncomfortable- too soft for us. Nothing critical, but if you're sensitive to wonky mattresses contact Max and Billie before booking.
2. The next building in currently undergoing renovations, which made quite a lot of noise during the day. We didn't care one bit, but if you're the type to sleep in until after 9am this may be a bit of a nuisance- so again, I'd recommend asking Max and Billie about it before booking.