We stayed at Stefano's for two nights. We were welcomed by his friend Gabi since Stefano and his family were away during our stay, fortunately Gabi was very proficient in English. A great perk of the apartment was that it stayed cool during the hot days, which was a great relief after walking around in 40 degrees Celsius. It was also really nice that the RER was only a short walk away and you could be at Gare du Nord in no time. If there were things to improve on it would be the somewhat dusty beddings and the fact that the bathroom didn't have blinders so the upstairs neighbors could have looked in from their windows.
All in all it was a good experience and I would recommend it to students like us who want a lot of space, friendly tenants and easy commuting.