Frank, we are really sorry for the inconvenience due to the works that the city of Dijon is making on place of the Cordeliers, to make this place pedestrian, and thus, more welcoming and more quiet.
You would have had to warn(prevent) us of troubles that this situation got for you because we would have been able to rehouse you in another apartment than we possess: Rue de la Préfecture, where there are no works at present.
The room is equipped well with a window which it was not recommended to open because of the dust cleared(released) by the works. This room is not absolutely wet under normal circumstances.
We solved the problem of the key as quickly as possible living in 30 mn of road of the apartment and we again apologize to you for this confusion caused by the previous tenants who changed keys on carry him keys.
Thank you for having underlined that the apartment is situated well and clean, we give it a big importance.