Fabulous location! It's 2 minutes to great restaurants and fun shops, 4 minutes from medium size groceries, and a lovely walk down Portobello Road starting at the much more interesting and non-commercial end of the market.
The flat is clean and comfortable. Lovely and warm--thick duvet and excellent heating. Easy to use the washer, too! Furnishings are elegant and a little bit funky, simple enough that it was easy to be comfortable, fancy enough to be fun as a home-away-from-home.
Alex will warn you it backs up to a school--so it's super quiet on the weekends, and a bit noisy on weekdays, but they don't start playing outside before 9 and it's not unpleasant--happy kids and bouncing balls, but no screaming or crying, they're tweens and teens mostly.
Very easy to get a bus straight down to Oxford Street and the heart of Zone 1, very easy to take the Tube anywhere in Greater London--it's on one of the better lines for easy transfers and good destinations.
Highly recommend Bluebelles around the corner for brunch--gets very busy on weekends but weekdays it was easy. It's about a mile down the length of Portobello Market to the Notting Hill Gate tube, and that's a pleasant, easy walk with lots to see along the way. Check out the itty-bitty Italian restaurant in the garden, tucked in the back of the shop with Garden on the sign--it's in the block past the Westway.