Marie her communication was very quick, and friendly.
About the appartment:
The seven stairs you need to climb is totally worth it. Not only because it's like you're on a movie set with its small, steep steps and narrow corridors, but the apartment is great as well! For how big the appartment is (20m2?) it is so smart furnished! There is a fridge, dish washer and oven in the kitchen. As well the couch is very easily fold and unfold to the bed (not that we did that every day though;-))
About the location of the apartment, that was awesome. You can actually see the light of the Eiffel tower in the clouds when lying in your bed. It's a 5 minute walk to the metro and you're wherever you want to go to in Paris within 20 minutes.