Summary: If I return to London, I don't really need to search for a place to stay, I found it. I just hope it is not full the next time I decide to make the trip!
Location: the property is 5-10mins walk from Kingston town centre. Kingston is a great place for shopping, eating out, relaxing to have a drink...basically it is a great town with lots to offer and plenty of character. You can easily get both buses (24 hour) and trains into London (~35mins to Waterloo) within walking distance of the flat. There are some very good pubs / restaurants (The Foresters is particularly good for food) close by.
Host: Extremely helpful and polite. Responded to any queries in what can only be described as instantly. Even had the heating turned on for us when we arrived, which was a nice touch. Couldn't ask for much more to be honest.
Flat: the flat was clean, and tastefully decorated...and the most important thing of all: the beds were comfy! It also has a garden and table and chairs outside to use which, means you are not confined to the flat.