I enjoyed my time in Isleworth - Kate and her family were very welcoming, laidback and easy to live with. The setup (personal bedroom and ensuite, with your own door to the kitchen) allows you to keep your privacy, but also means that you bump into people in the mornings/evenings too so don't feel too isolated if you're staying alone (as I was).
I gave a high rating for location because the house is well-connected to the overground and (via a short bus ride) to the Piccadilly Line and Richmond, but I found that commuting to East London was quite time-consuming, so wouldn't recommend doing this! Even then, it made all the difference knowing that I was coming back to a comfortable place where I could relax. I would definitely stay here again!