The location of the flat is good. Easy to reach everything by metro, the street is usually quiet. The flat is large and with lot of space very comfortable. Cleanness was average.
I must say that it was rather difficult to get the key for the flat, since we had to obtain it at a totally different part of Paris. So, if you travel from the airport by public transport this is very inconvenient if you arrive late night; we used taxi but here it cost us much more since we had to go to two different location. So, this is a clear disadvantage. If you arrive in a normal time, Pierre waits for you in the flat.
Also, we had trouble with the heating. In one room it was not operating at all, and in every room it was very noisy (also in the one in which it was not providing heat). Some people complain about airbnb guests being noisy - in our case the upper neighbour was sometimes inconvenient.