Happy to inform that we had a great time at Gaelle's place. All was well arranged due to the great and quick communication by both Gaelle and her friend Morgane. It was my first experience using AirBnb, so thank you for not making it a bad experience :-)
The apartment was great, clean, neat. Note that it's located on the 5th floor with no elevator, which is mentioned by Gaelle, for us no problem as it was good for exercising as well :-) Well located near the Sacre Coeur. There are plenty of restaurants, cafe's, shops around and several public transportation options, if it runs. Then again, everything is easily walk able within 30min.