Will and his girlfriend were friendly hosts, who offered their help to advise us with public transportation and responded very friendly to all the requests we had.
Their had free space in the fridge provided and we were allowed to use the clean and well equipped kitchen. We had towels provided.
As for the location, there were many buses going to the city center, especially the ones to South Kensington (change to Picadilly tube) or to Victoria. In a walking distance of 5-7 minutes there were supermarkets (e.g. Tesco Express), several pubs as well as fast food.
Overall, we had a pretty positive experience and can recommend the hosts!