Mathilde's apartment was the perfect size for our group of 5 (3 adults and 2 teenagers), with bedrooms for everyone, two full baths and a separate WC. It was surprisingly big for a Paris flat. And it has both a washer and dryer - dryers are hard to find in Europe. The apartment was perfectly located in the Latin Quarter (5th arrondisement) - a short walk to Notre Dame, Blvd Saint Germain, etc, along with dozens of outdoor cafes to choose from. The house was very clean, check-in with easy and she even provides a locked closet to store your luggage if you arrive before check-in.
I would highly recommend this apartment to anyone wishing to stay in the Latin Quarter.