It is a bit like time travel - only under modern and much more luxurious circumstances: staying at Guillaume's "chambre de bonne" on the 6th floor is fantastic, the view is marvellous, and if you don't mind a small studio plus sharing the toilet with someone else down the hall, this should be your choice. Clearly. Guillaume is really very friendly, he responds fast, and in case it works out with other bookings as it did in my case, he handles check-in/-out very flexible. Merci mille fois, Guillaume!