I started to sneeze as soon as I walked in the room, then my wife wiped the head of the bed and showed me the tissue which was completely black, and she had to wipe it down several times before it was reasonably clean.
The bed was ok.
The night time porter was good, helpful and polite.
One good thing was that it was very close to Montparnasse train station, which was very convenient to catch our early train, one less worry to have.
But overall it was not a 3 star hotel, just a 2 star, in my opinion.