I rented the townhouse for a three-night trip to Paris with my two (adult) kids. Location was perfect! The place was remarkably spacious and nicely appointed. The beds and linens were lovely, and the en-suite bathrooms were great. The tv room/office space in the loft gave us a pleasant place to unwind. (So fun to watch "Lupin" after touring the Louvre in the morning!)
The two water closets are on the lowest level of the townhouse, which means going down a flight or two of winding stairs if you need to use them during the night. Not a problem for us, but might be tough for older travelers.
Plenty of cafes, restaurants, and shops in the area. We also easily walked to the Marais, the Louvre, Gare du Nord station (we took the train from London), etc. When we wanted a snack, we could visit the fromagerie, bakery, wine shops, Turkish groceries, etc. just a short walk down the street.
Cedric was very responsive! We enjoyed our stay!