RS likes to reminisce about the old guest rooms, before all the mod cons, when the rooms were tiny and hot and the bathroom was down the hall. Did you think about what those rooms were originally intended for, and how they came about, and where they are now?
Chambre de Bonne were the maid's rooms in the attic of the buildings designed by Haussmann --
and there is a new podcast from 99% Invisible that gives a great sense of their history and how they continue to evolve:
https://99percentinvisible.org/episode/chambre-de-bonne/
Note that this is a podcast -- after you read the article, click to listen to the podcast, which is a bit under an hour.
Enjoy!