We had a lovely stay here. A great location in Paris with great nightlife around (I recommend Frog and Underground for reasonably priced drinks), 20 minute walk to Le Louvre and very close to Metro stations giving quick access to the city and major attractions like Eiffel Tower, Les Invalides and Notre Dame.
The property is quite small, but easy enough to stay with 2 people and not be under each other's feet. Bathroom and cooking amenities were great. It is set in a quiet courtyard with a good degree of privacy.
I would stay here again, three days is not enough to see Paris and staying with Paul and Marie gives you a great base to access the city.