Perfect apartment if you are a large group (can comfortably fit in 7-people), close to Gare du Nord and the Rebublique Metro line. Has all the comforts of home, including a much needed air conditioner. Love the touch of providing a wifi dongle for use by the guests that stay in the apartment.
Alexandre is a great host, very responsive and supportive. We were met on site by one of his colleagues who showed us around the apartment. I'll certainly recommend this place if you are a large group.