A&Y's flat is in a great central location in the city. It's near to the tube (and there's a bus stop literally right outside of the door). It was also really easy to walk to other parts of the city, and to Farringdon station (where you can catch the train to Gatwick).
The flat is pretty small, but the high ceilings help, and the furniture is wisely chosen to maximize space. Coffee provided via Nespresso (there are also several good coffeeshops nearby, which I found to be somewhat of a rarity in London).
A&Y were frequently in touch leading up to and during our stay, and responded almost instantly when we needed a little help heating up the flat. They also provided a nicely designed little brochure with a map and recommendations of spots to check out in the neighborhood