Eléonore was very accommodating with the check-in time, met us in person, gave us some tips, and was generally very good at communicating with us.
The building itself has lots of character. The room is very tiny, but well kept. There are lots of stairs leading up to the room, but there is a tiny lift which Eléonore thankfully helped us get our big bag in and out with. The shower is incredibly small, and both the shower and sink are off-bounds before 7am and after 11pm. This is mentioned in the listing, however can be problematic if you need anything, like even a glass of water, or to wash your hands when you come back from the shared toilet down the corridor, which does not have a sink. This is quite restrictive since one may feel concerned about making any noise at all, given that Eléonore specifically mentions she can hear the waterworks in the very old building. She is a really meticulous person, which comes across in the cleanliness of the room, and she was very hospitable, even getting us a second toilet-roll when we ran out.
The location was good since it was close to the Arc de Triomph, but often requires a fair amount of travel via the metro, to see most other sites. Also, things nearby are pricier than they are in other parts of Paris, since it's a fairly affluent-seeming neighborhood. The metro is close, which is extremely convenient.