I stayed alone in Gilian's place for two weeks while visiting my son who is going to college in Paris. The location is perfect. It is n a neighborhood that is lively but not touristy with two very good streets of restaurants and shops nearby (just outside the door on Rue St. Denis and two blocks over on Montorgueil), and you can walk about anywhere you'd like to go. It's a mile to the Louvre. Less than that to the Pompidou, and the Arts and Metier is only a few blocks. The closest Metro station has both the #3 and #4 lines, which makes getting anywhere super easy. There is a Monoprix grocery store two block away on Blvd. de Sebastopol (the food is on the basement level) and good specialty shops all around - patisserie, wine, cheese, chocolate, etc.
The beds are comfortable, especially the one in the loft, though I admit I only slept up there a couple of times. The kitchen is adequate, with everything you need. The shower was draining slowly, but that will be fixed before the next guest arrives. There was plenty of very hot water. The towels were not great quality. I was given two stiff, non-matching ones, and no hand towel or face cloth and one dishtowel. I think Gilian will update these things very soon. And keep in mind that the available washer is a Euro style washer/dryer combo, meaning your clothes don't actually get dry. This is common for these machines. The heater is a slow-reacting radiator but it works fine. There is an additional small wall heater in the bathroom.
I think this is really a perfect place to stay for a few days - charming and convenient. I would say snatch it up if you see it available.