We very much enjoyed our stay in Sandrine’s apartment. The neighborhood is perfect if you are traveling to Gare du Nord train station, as it is about an 8 minute easy walk. Also, right across the street is the Louis Blanc Metro stop on the pink line that goes to all the sights in the center of Paris.
The apartment itself is accessed thru 3 separate doors; one coming in from the street that requires a code, then thru a hallway to another door that requires a code, and then up a flight of stairs and down another hallway to the door which holds the key in a lock box/combination number required. So it’s definitely safe and very quiet as you are not facing the street. In the main room there is a kitchen, couch, kitchen table, and door to a bathroom that has a great hot shower. Up about 4 stairs is a loft bed that our daughter slept in and thru another door is the room with a queen bed. The only real window is in that room and faces an inner courtyard so the apartment is quiet and does not receive natural light so great for sleeping in and privacy.
Kitchen had all amenities you would expect. The apartment is in a no reception zone though, so be sure to get the WiFi going if you’re in need of using it or getting in touch with anyone. Overall, I would recommend this apartment if all of the things I mentioned fit in with your travel plans. Sandrine is a very nice lady and responsive to any questions.