We are a family of 4, with kids ages 10 and 12, and the space worked well for us. Our kids liked the loft, though the head room would be tight for many adults. The bedroom is spacious (for Paris) and spartan. The proximity to shops, metro, and Velib was very handy. Though it is on a fair-sized street, the apartment was quiet enough for uninterrupted sleep.
There was a problem with our check in, but Alberic moved quickly and was able to sort it out by the time we came back from dinner.
If you don't need or want to be right in the center of the city I can recommend this place as good value in Paris.