Host: Francoise is a wonderful host. Warm, friendly and available.
Location: The apartment is near the tourist epicenter of Montmartre, but still far enough away that it's quiet. There are two flights of stairs to get to the front door. My dad walks with a cane but was able to negotiate the stairs with relative ease. There are convenience stores within 10 minutes walking distance and - of course - you are surrounded by fantastic restaurants and eateries. The Sacre Coeur Basilica is less than five minutes walk from the apartment.
The apartment: The apartment is huge. Thoughtfully decorated, it's a treasure trove of beautiful art and furniture. At the same time, it's homely and warm and comforting. We loved coming home each day, opening the door and just relaxing.
TLDR; this is a fantastic apartment, Francoise is a great host, and I'm not sure we would want to stay anywhere else in Montmartre in the future.