Jonathan's property is in a quiet, leafy residential area and close proximity to the station. There is also plenty of off-street parking nearby for those who are driving.
The Airbnb is set up so that you have the whole of the top floor, which includes a lovely bathroom, to yourself. The room itself is very large and quiet, and there is even a small fridge and microwave.
Jonathan was welcoming on arrival and made it clear that he was happy to leave you largely to your own devices (which I was more than happy with given I had a couple of busy days ahead).
All in all this is probably the nicest single room rental I have ever stayed in. If you are put off by it not being central then don't be, the train takes just over 20 minutes to get into Waterloo!