We stayed in Berenice's apartment with our 2 young children and we all loved our time there!
Close to the local Auchan supermarket and also Place De Clichy Metro, exploring Paris was so simple! Montmatre and Sacre Couer are only a short (approximately 15 minutes) walk away. There are also plenty of restaurants within a couple of minutes of the apartment.
The apartment is well presented and clean throughout with everything you could need for your stay. The sofa bed was easy to set up and put away. The kitchen had everything you needed to be able to cook and eat in during your stay. The apartment building felt safe and friendly and was generally quiet (apart from some building work going on during the day, but we were out so this didn't impact us).
I would note that the large windows in the living area and the bedroom have a low level railing - our children are 4 and 6 and understood that there was to be no climbing or leaning over the railings, but perhaps not suitable for younger children as you are on the second floor.
In case it is helpful to anyone - my daughter and I are vegan and we found a lovely vegan patisserie (Land&Monkeys) 5 minutes walk from the apartment which we walked down to each morning for fresh croissants, pain au chocolat and cinnamon rolls. There is also a health food store close by called Naturalia which had a large range of vegan food (far more than Auchan).
Communication from the host was fantastic and key collection was extremely easy. We arrived in Paris early in the day and departed late on our last day - we used the Stasher luggage facility recommended by Berenice at the nearby Ibis Hotel and found this extremely convenient and easy to use - we stored 3 bags and it cost us 20Euro in total on each occasion.
We would highly recommend Berenice's apartment and wouldn't hesitate to stay here again when we return to Paris!