Staying at Cécile's was a pleasure. The apartment met all my basic needs and is within 10-15 minutes walking distance of the Louvre and nearby sites; the metro is easily accessible. The area around Porte Saint Denis feels less touristy than other parts of the city and hosts a wide variety of global cuisines - lots to choose from! There are a number of adult themed shops in the area and in that respect it's not the most family-friendly location. It is well-populated and seems safe, however.
Cécile was a gracious and extremely helpful host, happy to share her knowledge of and love for the city - I very much enjoyed our conversations! I would be happy to stay here again.