Stayed here for a weekend w/ husband, two kids (3&1) and my mom.
The studio is big, full of morning light and has a beautiful terrace. The terrace was great for us, we ate breakfast out there in the morning, used the electric grill in the evening and hung out there after the kids went to bed.
Other positives points for the apt- great shower and a closet to store all of your stuff right as you come in the door. That's why we were able to enjoy a studio with so many people w/o feeling crowded.
This place is easy to get to from Gare du Nord and is right across the street from a metro station. The Monoprix downstairs has everything you could need for your home away from home and is open until 9. On Sunday we went the market which was immense and offered a diverse array of both fresh and prepared foods. There is also a big playground right there.
Gaëlle, our hostess, was charming and very professional. She sent me an email ahead of time telling me how to get there. Inside the apt there is are write-ups in both French and English telling you what there is to do in the area and anything you might need to know about the apt.
I would recommend this place for: families with young children and couples looking for a romantic getaway in Paris.