I can understand your deception. The apartment is indeed very small, but I never tried to hide that. The pictures perfectly match with the reality.
The previous guests all left good comments about my apartment.
Don't forget that you paid a very cheap price compared to what you would have paid elsewhere in the area. It is a student apartment, accomodation in Paris is very expansive, and I understand that you may have been surprised. What I deeply reject, is the way you undermean that I cheated on the pictures, which is absolutely not true.
Regarding the dirt you pointed, I just want to inform you that a cleaning lady always comes between two reservations, which has never resulted in any critics before yours. If there was some bady cleaned parts, I am sorry about that. Be sure that if you had informed me with that during your stay, I would immediately have done all what is possible to do to arrange it.
Anyway, I wish you all the best and I hope your future experiences with Airbnb will be great.