My boyfriend and I stayed at Bastiens place for two days while we were visiting Paris. Unfortunately we didn't meet neither Bastien nor his roommate, so we had the apartement to ourselves the whole weekend. But communication with Bastien was great and we could always get in contact with him very easily.
The apartement offers everything you might need and the room is big enough for two people. And overall it is very clean which was nice.
The apartement is located in the 18th arrondissement just a short walk away from Sacré Coeur. And there is a metro station right in front of the building which brings you to the center in less than 20 minutes which is pretty convenient.
All in all we had a very nice stay at Bastiens place and would definetely recommend staying there :-)