Marc was an excellent host--very communicative before our visit. He met us when we arrived and showed us the apartment, also pointing out nearby attractions, restaurants, and transportation.
The apartment is just as described--it's on the 6th floor of a building with a tiny staircase, but there is an elevator from floors 2 to 5. The apartment itself is small but comfortable--perfect for a couple or one person. The terrace is extremely charming, set among the rooftops of Paris, with gorgeous light, especially at sunset.
The location was very nice--20 minute (or less) walk to Notre Dame, <10 minutes to Centre Georges Pompidou. Very close to many restaurants and lots of good shopping.
I highly recommend this charming apartment! Merci bien, Marc!