I had a super stay at James' house. Everything was as advertised and James was an excellent host with loads of useful tips and valuable advice for someone visiting London. The bonus of staying at James' BnB is that you are within easy reach of all the attractions of central London and yet still be a peaceful neighborhood. It's also not everyday that you get to meet an author, let alone stay with one. The room is definitely great value and being positioned very close to Wimbledon Chase station (thameslink) and Wimbledon (including the underground) means a quick and painless transit to the center of London.
Would I recommend James' BnB? Absolutely, without a doubt!