Anna's place is great. The location is fantastic, a short walk to the Hampstead High Street, Tube, busses, shops, and restaurants. It is small, perfect for a single like me, or a very close couple.
Well equipped kitchen with an excellent washer/dryer. Small shops abound, but I got most of my groceries at the M&S Foodhall in South End Green (#46 bus down the Hampstead High St, or a pleasant walk).
Weekdays, the noise of joyous schoolchildren during the day would not make for a quiet getaway, but if you are planning on being out, who cares? Otherwise the flat is blissfully quiet nights and weekends, the sound of traffic all but inaudible under the morning birdsong.
Don't miss the Saturday morning market inside the gates of the Everyman theatre near the Tube station. Wonderful foodstuffs all year round and lots of fresh veg during the summer months.