Tia's place in Surbiton is a good launching-off point for exploring London.
Pros: Super close to the train station (literally next door); clean (despite the somewhat shabby entrance to the second floor flat); pretty well-stocked (although a hand towel would have been great to have so we didn't have to dry our hands on our bath towels); walking distance to takeout restaurants, a pub, and a grocery store; parking (street parking, but fairly easy to find close by).
Cons: Noise (from the trains and the street below); heat (a second fan would have been great so both bedrooms had one); a secure shower rod (it fell down twice on us); lack of clear instructions re: wifi access (the Airbnb site said one thing, the welcome pack said another, and neither was accurate); and the entry code to the street entrance didn't seem to work.
Other notes:
There was one plumbing issue during our stay which Tia resolved quickly.
The neighborhood felt safe, BUT the front door to the flat can be directly accessed from the street if one just walks around the building to the back. The neighbors seemed to leave the main entrance to the flats propped open, so the only locked door was the one to the flat itself. We didn't feel unsafe, but this could be explained more clearly in the description.
As another reviewer noted, it is not easy to heft large luggage up the second flight of stairs to the flat - they're very narrow and include a turn.