As all the good things I could say have already been well said by earlier reviewers, I'll be lazily efficient and just note that all the positive reviews are spot-on. I'm here for four weeks of research at the National Archives, and am absolutely delighted with these lodgings and with Sandra as a host. The location is excellent, an easy walk (about 500 yards) both to the Archives and to Kew Garden station, where you'll find good restaurants. A very nice neighborhood. Many more good restaurants and shopping one stop down the line at Richmond.
The room is very attractively decorated and well fitted-out. Hot water at taps and shower within seconds. Skylight windows are of top-quality hardware, open and adjust easily. Air conditioner is modern and quiet, but I hardly used it as I could regulate the temperature and get fresh air just as I wanted through the windows (some road noise, but not at all bothersome, at least to me). Reading lamps at the bedside are of good quality and nicely adjustable.
Excellent attention to detail throughout.
Minor caveats: as the description says, this is "newly converted top floor of our home and is accessed through the main house", meaning you're climbing two flights up a winding staircase. Though they'll help you with heavy luggage, if you have serious mobility problems this might not be for you (but I'm 73, large and out of shape, and was quite all right with this). Note also the chairs and table are simple, adequate for a light meal and for a few hours work at a laptop. But they also offer a larger apartment with more comforts also for an attractive price.
I'd give six stars if I could.