Literally in the heart of the Marais, and a few blocks from a fabulous food court, Marche des Enfants Rouges. This is a fifth floor walk up, no elevator, so be aware of that. It was a very pleasant crash pad for a few lovely days in Paris.
Sarah‘s communication was quick and friendly, and though she was not in Paris when I arrived, her friend met me and got me into the place without any issues whatsoever.
If I have anything negative to say, it might only be that the water closet is the tiniest bathroom I have ever seen. But it worked perfectly well, so no complaints.