My wife, our six-month old daughter and I visited Paris for 10 days to visit her mother and stayed in Marine's apartment. We found it to be charming, clean, and cozy. It was very convenient to shopping, grocery stores, the bus line (there's a stop right outside the apartment), and the Seine. It is about a 25 minute walk from the Eiffel Tower. As other reviews have stayed, the pictures of the apartment don't do it justice. It's a pretty small one bedroom, but was very nice.
Marine was conscientious and made sure we were able to check in without any trouble. She was also easily accessible during our stay. The only downside was that this apartment is on the 4th floor of the building (5th floor according to US standards), and there is no elevator, which is typical for Paris. This made it a bit challenging when we were carrying baby equipment and luggage up and down the stairs. Fortunately, the building was safe and we were able to leave the stroller folded at the bottom of the stairs without incident.
Overall, we would recommend Marine's apartment and would be happy to stay here on our next trip.