We stayed at Joy's/Nicolas' place for Two nights and we enjoyed.
Location was very good,the apartment is right in front of Chateau D'Eau which is great -it connects to any other main lines in Paris.
A shame about the movement of individuals all day long, hanging out in front of the station dealing with God knows what.
I didn't feel safe getting in and out of the apartment.
The code pad on the street door sticks a bit,so is hard to press the numbers down to get in which made it even worse with people watching us.
Despite those little issues,the apartment was spotless,Nicolas kindly allowed to leave our bags in our first day as we arrived before check in time.
Great and effective response from both Joy and Nicolas.
Thank you both.