Cherie -
From that page linked to above, you'll find what you need to know about the prefettura:
As far as this explains, and from my own experience, the Prefettura LEGALIZES the consul's signature as VALID so they need to have the consul's signature on file. Since you can do the nulla osta in either Rome or Milan, and only those two addresses are given, I would take it as confirmation that you need to go to the
prefettura in Rome to get it legalized. Not in Florence.
You have to read these files and follow them to the letter. Get that revenue stamp (marca da bollo) before you go the office, you will be turned away if you don't have it.
The
Marriage Office in Florence is the one in Palazzo Vecchio - the one that I called to help you out and doesn't speak English. Have you seen they do have a
page dedicated to requirements for Australian citizens getting married in Florence?
Print that out and make sure you follow it to the letter, getting all the documents you need to come for the day of the appointment (at the marriage office in Palazzo Vecchio), a few days before the actual marriage ceremony.
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