We stayed at Barbara's place for 3 nights for bank holiday weekend in September and everything was perfect! We had our two small children of 16 months and 4 years old and they loved playing with all the toys!
The place is perfect for a family with children and the pushchair, high chair and all the baby cooking equipment was very handy and meant we didn't have to carry any of it with us.
The only drawback is the noise from the bars outside but easily solved with closed windows. The Marais is a lovely part of Paris and I would recommend Barbara's apartment highly!