Ann's place is exactly as described and more. Ann is a most gracious host, who offers amenities such as breakfast, clothes washing, dinner and even changes your bed sheets for you - all things very rare at Airbnb's.
I stayed for 2 weeks during an internship, and the house is great for getting into central London by either national rail or the underground. There is easy to navigate bus services to the main stations, and it took me around 20 mins to Blackfriars station from Streatham station.
If I ever need a place in London in the future, I would definitely pick Ann's place again.