Maximilien's place was really great! We were there for 4 days. It is very centrally located to everything - the metro is a 3 minute walk, Notre Dame was a 20 minute walk, as well as the Louvre and beautiful gardens. It was on a quiet cobblestone street right around the corner from many small cafes and shops.
The apartment was small but beautifully decorated - with everything you need. There were two of us and it worked perfectly.
Maximilien was very friendly and kind - there was a small plumbing issue the first day and he dealt with it immediately.
I would highly recommend Maximilien's place.