Tiny apartment, about 17 sq meters.
Definitely not for 4 people, not even if two are kids.
No privacy - had to send the kids out to the courtyard so we could change!!
What little space there was was taken up with too much furniture. And all the furniture was full of the owner's stuff, so no place to keep our stuff.
Only had sofa for three (at a pinch).
Poor internet and instructions. Had to download instructions for the washing machine from the internet!
Not facing the Notre Dame as stated, but tucked away in a side street.But is close to Notre Dame - about 500 meters,and Louvre - about 1 km.
Not very clean - black mould in the bathroom.