We were staying two days with two kids. Very quiet, clean and very homey. Andy is a very caring host and quick to respond.
Wanstead subway station is a short walk from Andy's house. Central line will take you to the city center and it does not take too long.
There is a big park not far away, where one can find a playground for kids or just have a picnic. There are food stores, cafe/bakeries, restaurants and flea markets for books and other goods. Basically, you've got all you need :)
We will def come back, Andy!!