This place could be a great spot for some, but it wasn't good for our family this time. We were there during a heat wave and the busy location and lock of AC made it not very pleasant to be inside. Valerio did allow us to buy more fans, which helped. In the evening, opening the windows meant that we got the street noise from the numerous bars below, and could even smell the smoke from the patrons seated on the patios. Closing the windows was not ideal either as the apartment heated up so much that even with the fans, it was uncomfortable inside.
Some things about the location are great. There's a grocery store right across the street, and the metro station is just a few blocks away. The small kitchen is well setup and stocked to make basic meal preparation easy. The double locked doors keep the place safe from people off the street coming into the building.
If you're coming to Paris to party and there's not a heat wave, this place would be perfect for you, but for our family holiday, I should have chosen something else.