Fantastic accommodation, had no troubles getting to it as there are direct lines to Chadwell Heath. However, it is a bit far out if you want to go sight-seeing, but not too much (you should be in center in 15-20 minutes by a tube).
Alexandra and her mum are fantastic! Made us tea, made sure we're not cold and even got up in 4AM to drive us so we don't miss our flight.
Highly recommended.