Apartment is small but is as described. Walls are thin and you can hear all your neighbors in the building. This maybe the case everywhere in Paris? One of the neighbours had a party till 4am but were kind enough to warn us and gave us a bottle of champane for the disurbance the next day.
Returning to the apartment at night requires a flashlight or phone light as it is very dark and the light switch to the narrow stairway is upstairs. Wifi is a great feature however one out of the 4 nights it was unavailable. It was very cold even with the heat on (december).
The location was excellent. Very close to Metro, and the Louvre. Well within walking distance to many attractions. The location alone is worth considering staying here.