Vivian is a very warm and generous host. She was very accommodating with our early arrival, offered us delicious coffee and snacks, and made sure to check in on my friend and me several times throughout our trip.
The apartment is perfect for up to two people; it's small but has all the essentials, and the bed was comfortable (there's a spare bed too, which we didn't need). The heat and hot water worked well during our cold January stay, and there were extra blankets as well. The location is great--very close to the Canal St. Martin, with lots of shops, bakeries, and restaurants/cafes near by. The closest metro was closed for construction, but that wasn't a problem at all, as the next metro was still just a five minute walk.
The biggest issue for me was the noise from neighbors within the apartment building itself. Outside noise isn't an issue at all, but the walls are thin and the upstairs neighbor(s) also seemed to like walking around in shoes on the wood floors...this might be an important factor to consider if you're a light sleeper.
Other than that, the apartment was good and as described, and Vivian was a great host.