Glynis' apartment was the best out of our choices on Airbnb so far. It is in excellent conditions, very clean and it has a lovely atmosphere. The bed is super comfortable!
The studio is attached to Glynis' and her husband's house, but it has a separate entrance. This means that the communication with Glynis during your stay is very easy, but you're not disturbed by the closeness (and vica versa hopefully :))
Glynis is a great host. Helpful and effective in communication. She was available at any time we needed. She arranged the taxi for us from New Malden to Heathrow (28 pounds) and even left some breakfast in the fridge for us.
You can get to Waterloo station in ca. 25-30 min. We used this traveling time for preparing our day trip, so didn't mind it at all. The trains run in ca. every 15 min and the station is 5 min walk from the house. The last train from London leaves around 1 am.
You can find some bakeries in New Malden, where you can have breakfast. There are some restaurants as well, but we didn't try those.
If you're looking for a place at a relaxed location, want to have a great night sleep and cleanliness is important for you, I truly recommend Glynis' place.