Overall we enjoyed our stay very much. The apartment is large and beautiful, with plenty of natural light in the front sitting room. The bedrooms are large and comfortable, and the showers are spacious (which I've found to be uncommon in Paris). We found the location to be top notch, with plenty of metro lines running through Place de la Republique.
The wi-fi connectivity was unreliable throughout the week we stayed there, which I would encourage Ludovic and team to correct for future guests. While the apartment itself was spotless when we arrived, two items are worth noting: (1) we spotted a mouse in the sitting room late one night (it's an old building in Paris, after all) and (2) the hallway on the entrance floor of the building appeared to be under construction while we were there.