The four of us (2 adults, a 7yo and a baby) loved our 2-night stay at Pauline's unique and charming apartment.
The location is superb, particularly for travellers from/to London by train (a convenient walk from Paris-Nord 🚆 station) and for access on foot to parks, street entertainment and drinks/food in Montmartre and breakfast type places even closer.
The flat itself is well-lived in, so the family's own items are everywhere. We found that lovely but just be aware that it isn't an empty space, so prepare to "live out of your suitcase" for the time you're there.
Children will enjoy the details in the kids' bedrooms.
The walk up and down the spiral staircase is not for the faint-hearted! We travelled with a baby buggy/stroller which we left on the ground floor.
In the heat of the summer, being able to enjoy the breeze in the shared garden space is a big plus.
I wish we could have stayed for longer. Definitely one on the 'wish list' for a return visit.