Everything went well, we were 4 adults and a 5th month baby and the place was big enough. Cecilia was so kind to arrange a baby bed for us at no extra charge which we appreciated. Maybe the bathroom might be a little small for some people but we're in Paris so it's kinda common.
The apartment is close to supermarkets, boulangerie and a drugstore. Also it's very close to the metro and there is a bus that's stop almost in front of the building. If you're planning on a visit to Montmartre, you can easily access by walking it's a nice walk within the streets of the city.
I would totally recommend this place to a friend and I would definitely comeback.