Caroline's apartment was a great fit for our family of 3 (us and our 4-year-old daughter). The location was excellent with the convenient #4 Metro line just outside and easy access to all the major sites, as well as being easy 5-15 minute walking distance to many things (Les Halles, the Marais, Rue Montorgueil for restaurants/shopping). There's a boulangerie on the corner and 3 grocery stores within a couple of blocks.
The apartment itself was as advertised - tons of natural light from the skylights (with shades for nighttime), great views of the Paris rooftops as well as the Eiffel Tower and Sacre Coeur, and a good size kitchen and bathroom for Paris standards. There were even a few toys and French books to entertain our daughter. Caroline was easy to communicate with for check in, as well as during our stay.
There is standard city street noise from the bedroom, which faces the street, but you are on the 7th floor, which helps. No issues with loud noise from bars, etc. and the pull out sofa in the living room was further removed from the street noise and was equally comfortable. We were extremely happy with our stay and would certainly recommend the apartment!