We enjoyed our stay at Yann's apartment. Apartment is quiet big for our family with 2 years old child. Though it's an old apartment in French style classical building, it's well furnished and renovated.
Sometimes it was challenging to get to the 4th floor with a stroller, but then we figured out that we can leave it downstairs.
Location is perfect, all the main places are in walking distance. Having such a good location, the street is rather calm. Overall I can recommend the place for a big family or 2 couples.