I cannot recommend Mireille's place highly enough. She definitely has a stylish and welcoming place, and the neighborhood is quiet and laid back - this is not to say boring, as there is plenty to do since Hanwell town center is right around the corner. It is especially useful if you are flying into/out of Heathrow - it only takes about 30-40 minutes via the bus and tube (certainly a relief after a nine-hour flight).
Mireille is very knowledgeable about the the area, and London in general. She recommended a local pub, The Fox, that I grew to like quite a bit in my time at her place. On my arrival, she greeted me at the door and gave me the tour.
The room is accommodating both for short stays or longer visits - and she has it set up very well for her guests. I never had to ask or request anything after the first day since she was thorough and considerate in preparing the room.
Location-wise, I found Mireille's place ideal. If you want to sightsee in London, it should only take about forty minutes to reach the Palace of Westminster. Her place is ideal for researchers intending to do research at the National Archives (just south of her place) and at the many other repositories throughout the city.
Lastly, the cat is exceptionally well-behaved - in fact, I sometimes forgot he was there. It took a few days, but he eventually warmed up to me.
All in all, Mireille's place is highly recommend and I enjoyed my stay.