We stayed at An's place for 10 days and had a great stay. An let us drop off our luggage at noon, even though check-in wasn't until 3:00. She was there to greet us, give us the tour, and answer our questions. The apartment itself was in a great location with a bus stop right outside and small grocery stores right across the street. We felt very safe in this neighborhood.
A couple things you may want to be aware of if you plan to stay at An's. First, this is her home. She rents it when she's not going to be there. All of her clothes, toiletries, etc. are there. It's not a problem, but if you are used to more of a full time rental feel, just be aware. Second, her flat is three floors up and there is no elevator. If you have trouble with stairs, this would not be the place to stay. If you're reasonably healthy, it's fine. For the price we paid, this was a great value and everything we needed to see London.