This was a wonderful Carthusian monastery, vacated by the Carthusians only shortly after WW II.There used to be a Carthusian house in Rome also. UNfortunatly there has not been a Carthusian presence in the Eternal City for 150 years or more.I read a while ago that the Jesuits are down to so few in Italy, that this year they only have 2 novices for all of Italy....and in Rome itself, they are down to only 2 parishes (in addition to the Church of San Ignazio, Il Gesu, and the Gregorian Institute--where even there they're a skeleton crew compared to before Vatican II). 50-60 years ago, the Jesuits had about 15 additional parishes in and surrounding Rome. All gone.
Napoleon vacated the Carthugians from Firenze.
What does the inscription say?
It is a Greek word which litterally means, "place for the keeping of sacred things," hence "sacristy". The other door opposite is labelled (also in Greek) "lipsanophylakion" - place for the keeping of relics. Thanks for the pictures!