We didn't meet Marine - which was a shame because she seemed really accommodating and friendly in emails. She left clear instructions and a great welcome present!
Her flat is exactly as described - very comfortable, clean and stylishly decorated. We went with 2 adults and 3 teenagers - and the apartment was big enough for us to feel we had space.
There isn't a huge kitchen to cook grand meals in ... it's functional though. However, when you have so many great cafes and restaurants on the doorstep, this isn't an issue. Marine recommended 2 to us which were fantastic (Paris Hanoi and Chez Paul).
The apartment itself is in a great location - about 1 minute walk away from the metro - (we got a Paris Visite ticket which was a great idea). Supermarket is 1 minute walk away and bakeries less than that distance. A fantastic base for exploring Paris.
We would absolutely recommend Marine and this apartment. A great holiday!