Celine's apartment is much larger than we expected. The 4 flights of stairs were a challenge at the end of some long days, but definitely not a reason to not stay in the apartment.
One bedroom opens over the garden area and two open above the street. The street noises can be loud at night so there are small fans provided in the front two bedrooms. The air conditioning is only for the living room and kitchen. The bedrooms utilize the cool night air to provide a comfortable sleeping temperature. Unfortunately, it was extremely hot and humid when we stayed in Paris so most of us slept on the floor in the living room.
Céline has detailed notes for visitors that helped us a great deal. She's also great about responding quickly and providing backup contacts in case we needed anything during our stay.
There is a Metro stop very close to the apartment, a Monoprix a few steps away and several delicious restaurants. We stopped into one to watch the World Cup and I had the best creme brulee I've ever had in my life.
I'd highly recommend this location to any group in lieu of a hotel stay. You will have more room and a wonderful gathering space right in the apartment.