My husband and I stayed in Marie's cozy apartment for a long weekend in Paris. The flat is literally above the Cardinal Lemoine Metro station and 3 minutes walking from the Jussieu stop, so, it was very easy to get there from Gare L'Est. The area is bustling. There are restaurants and boulangeries everywhere. Notre Dame and the Seine are an easy walk from the apartment.
Marie was there to meet us when we arrived. She is so personable! She showed us where all the essentials were and gave us suggestions for places to eat, good walking routes for sightseeing and instructions for getting around easily. Though she didn't speak much English and my French is rudimentary at best, she did a great job communicating with us.
The apartment is cute and small but not cramped. The bed was very comfortable and the water pressure in the shower was good. There is a petite kitchen with everything we needed for our stay.
You may have some issues if you are a light sleeper and not used to city noise. The Metro trains rumble underneath the building frequently. The upside to that is, it is easy to get everywhere.

We had a wonderful stay in the lively Latin Quarter. Merci, Marie!