On the plus side, we were welcomed very punctually, the apartment is super conveniently located, it is light and bright with lovely district views, and it wasn’t too hot even during a massive Parisian heatwave. The hosts also provided lots of things to make the stay easier for a young family (spare stroller, travel cot, washing machine, dishwasher, lots of towels).
On the downside, it is not in the condition that it appears in the photos: the apartment really needs a bit of attention to fix the peeling paint, broken light fixtures etc. And it really needs a good spring clean.
So stay here if you want something convenient and central, but keep the expectations modest.