We've had the best stay at Shannon's & Kay's (and their two adorable cats) ! They are lovely, very friendly people, you'll feel just at home.
Their place is very clean and brand new, and the bed is so comfortable (which is very important when you walk in London all day !)
It's close to the train (the DLR) it will take you to central London in no time.
Don't hesitate to ask the girls for any advice on where to eat and what to see in the area, they have a lot of good adresses.
Thank you again !