I had a nice stay at Kevin's place, communication was swift and efficient and the apartment is good and is close to the metro.
I've read reviews about the location not being that great, it's true that neighborhood is not the best in Paris, nor is a touristy one. it's true there is more beggars in the street and homeless people which is something in all the 19th arrondissement. Personally I didn't have an issue with that as this was a work trip.