Overall, we had a good stay.
The location in the heart of Paris, at the corner of Bld St Michel and Bld St Germain, cannot be better. Ample parking space is available on premise, in the interior court of the building; that is a huge plus -- practical, safe, and it saves you 42 euros a day on public parking (Vinci). Check-in was easy; we were in contact with the persons who gave us access, keys, garage door opener, door codes, etc. Mr Martinez did not know the apartment but manage to figure things out, and even helped with all our luggage.
The apartment is as described. However the pictures are nicer; they must have been taken a while ago, as they show a spotless and new (or newly refurbished) apartment.
Since then, wear and tear have taken some toll. Chairs at the "bar counter" need to be replaced, or reupholstered, as the covers are falling apart. Bathroom shower knobs are falling in the tub, fridge door handle is broken, etc. The cleaning crew could do a better job; the apartment was dusty (needs vacuum cleaning, and furniture dust off), the kitchen counter and the area around the sink need a deep clean -- we may have left things in a better shape than what we found. However, beds, linens, towels were fresh and spotless clean.
These details are important and they show that there is no "owner pride" (but surely a management company). It is a bit of a shame because the apartment has a lot of potential.