I stayed at Corinne's place with my friend for a week and it was perfect. You cannot beat the location! It's right in the heart of Paris, close to Notre Dame, and just across from Les Halles shopping center and metro station. There are two docks nearby for the Paris biking system, Vélib, and the neighborhood is full of delightful shops and restaurants. Even though the apartment is in a busy neighborhood, it is completely quiet inside, so you don't have to worry about noise at all. We always felt safe in the neighborhood--no worries about that.
Because it's in such a prime location, we hardly used the metro system and used bikes to get everywhere, which I highly recommend.
The apartment itself worked perfectly for us--there was a small fridge, clean towels, shampoo, hair dryer, a teapot and espresso machine. They also had dishes in the apartment, which was good for us since we ate in the apartment at least once per day (you have to wash the dishes in the bathroom sink, but that was cool with us). The bed is huge and very comfortable, the bathroom was clean, and the shower was great.
Corinne and Emmanuel we're welcoming and responsive in coordinating beforehand and during our stay. They're great!
We absolutely recommend this place! We loved it immensely and would love to return. Merci Corinne et Emmanuel!