Our family of four recently stayed at Jean Noel's C2 apartment and had an excellent experience. The location was great with numerous eating options in Rue de la Mouffetard, an easy 10 minutes walk away, if you felt like walking beyond the ones downstairs. We had a lovely meal downstairs at La Methode on our first night. We found two metro stations close by - St Michel/Notre Dame and Rue Monge. The Pantheon is literally around the corner. The area felt very safe with lots of locals about. There was a pub a few doors along but street noise was not a major problem.
The apartment itself was well furnished with comfortable beds and sofa to relax on after a day out sightseeing. There is lots of closet space in each bedroom and the bathroom while smallish, was very functional. Check in and check out was very easy and the apartment building was well secured as one needed a door code for the front entrance and then a separate tag to open the latch on the interior gate that then allowed access to the stairwell.
There are stairs which some travellers may find difficult with large suitcases but these were not problematic for us. There are lovely windows looking out onto the street and afforded lovely natural light into the rooms.
Overall, we would highly recommend this apartment and Jean-Noel as a host.