In the world of AirBNB three things matter: the apartment; the location; and the host. In this case it hits a 5 on all three.
First is the apartment. It's spacious, perfect for one, or for a couple. It's on the ground floor, so no scary coffin elevators or 5th floor walkups. Most of the light in the space comes from skylights or frosted windows, so while there aren't sweeping vistas of Paris rooftops there is a very nice, light, and a cozy feel to the place, and privacy. The décor is very personal - not some semi-sterile rental only unit. The kitchen is fully equipped (including a really good dishwasher), the bed is comfortable, and the shower has great pressure and plenty of hot water. There is a washing machine and dryer, so you can pack lightly and leave space in your luggage for all the amazing things you are going to buy, because...
The location is amazing. The apartment has two entrance, one a traditional courtyard, the other directly onto a main boulevard. The subway entrance is about 200' from the secondary entrance, on line 8, and you can get most places in Paris in half an hour on the subway. There is a great bakery and a good grocery store 5 min from that entrance, and Maison Plisson is 10 min if you want high end groceries. Going out the main entrance lands you in the Marais (about 2 blocks from the ancient site of the Commanderie of the Knights Templar), very close to Rue de Bretagne, which is full of gourmet shops and restaurants. Check out Verot for amazing pates, Stevenot for roasted meats, and if you want macarons you have both Laduree and Pierre Hermes. Tout Autour de Pain, which was voted best croissant at some point, is 7 minutes, and worth the walk. And don't miss the Marche des Enfants Rouges, with all it's amazing food (I especially liked the couscous there - it was about the best I had). It's a 25 minute walk to the center of things - Beauborg, Ile de Cite, etc.
And finally, Chantal and her husband are amazing hosts. I mostly communicated with Chantal, and she was fast to respond, and made herself easily available for my arrival and departure times. Her instructions were clear and thorough. On check in she helped me understand the apartment, the neighborhood, and tips on how to enjoy myself. Chantal checked in appropriately, but not in any kind of obtrusive way.
So, this place is a trifecta. Great apartment; great location; great host. I can't recommend it highly enough.