Above all Sandrine offers a fantastic location. Thirty seconds from a Metro station or from the Seine with a stunning view of the Eiffel Tower. Everything you could need is found in the neighborhood: restaurants, groceries, laundromat, etc.
She also offers great hospitality and easy and quick communication (in English!). Best for the solo traveler (unless you are extremely intimate), all your needs are met in a compact, functional space. Claustrophobes beware.