The apartment is exactly as described- beautiful, clean, close to metro and easy walking distance to charming local shops in Montmarte. The neighbourhood is clean and safe (walking home from the metro with teenage daughters was never an issue), but watch out for motorcycles and mopeds riding the sidewalk (!). We had an unforseen issue with plumbing in the bathroom which our host cleared up promptly and coordinated around our schedule in order to get the repair done with no inconvenience to us, even arranging with a neighbour to share facilities until the problem was resolved the next day.
She provided assistance about transportation and favourite local restaurants or points of interest.
The apartment is a 45 minute train, then metro ride from CDG airport, but easy to find. All points of interest from the apartment were less than 20 minutes by metro. We would recommend this place to a small group or family. The bed is comfortable and so is the sofa. The appliances are quick and efficient, easy to use.
Just beware that the apartment is on the second floor of a walk up with a tiny elevator for use if carrying heavy luggage. The exercise up and down the stairs was a welcome part of our day, as we spent most of our vacation walking.