My partner & I loved it. I treated him to a birthday weekend in London and chose Air B&B to be more flexible (as opposed to staying with friends which is what we normally do). I knew the area Heather is located in fairly well and that it would be a good starting point for us so there were no surprises; but the accommodation surpassed our expectations. In addition to our room we could have accessed the lovely lounge with view on to the garden as well as another room - and would have done had we had more time! I would therefore recommend Heather's place for a longer stay as well.
The location in Isleworth is peaceful and quiet but ideally situated between Richmond (and its tube/train station) and the Isleworth river pubs. It takes about 20 mins walk to reach either (we always enjoy the walk to Richmond via the Thames Path!) or there are buses passing nearby.
Heather is an excellent communicator and it was interesting talking to both her and her husband Tim. The room we stayed in was spotless, with some personal touches, as was the bathroom. All in all we felt almost part of the family despite a brief stay of 2 nights. Both Heather and Tim were very helpful and cheerful hosts in all respects - we will come again!