We (2 adults, 4yo and a 22mo) enjoyed our stay of four nights. The sofa bed is quite comfy for two small adults and the bedroom was able to squeeze in a baby cot.
We expected the apartment to be cozy as it seems all Parisian ones are but other than storing our suitcases in corners, it was quite comfortable.
We really loved the area the apartment is in- super diverse, near the canal with lots of people/families enjoying strolls/parks/playgrounds etc. Really convenient to several bus and metro stops.