Response from Sophie:
In the 20 years we've been visiting Paris, we never had such a bad experience as this one, due to the very loud party going on all night long on next doors appartement. We had no sleep at all. As a host, you neglected mentioning this risk although parties are frequent according to another neighbor. Contacted you 3 times, even during night, to get to intervene as you previously offered. You took no action. Very disappointing.