Rome?, What's the 'genius loci' there? Options

[Witness]

By genius loci I of course mean 'spirit of place' or general atmosphere. But you already knew that.

Darn it if my players aren't in the unusual position of having to set up an important meeting with an illustrious personage, and being able to choose more or less where, when and how it will take place. And one of my PCs has a Cardinal friend in Rome, so apparently that's the destination that they favor.

I find myself thinking 'cool', and I'm really looking forward to the role reversal of having them work out the defenses (yes, there may be people trying to intercept this meeting and snatch the.. um.. meetee).

Only problem is that I have no source material on Rome. Don't have Shadows of Europe. Don't currently have the means (or more importantly the time) to acquire it. And Sixth World Wiki lets me down in this regard.

So if anybody can advise me on any major canon stuff I should know, and any non-canon stuff that would fit and would be cool to know, then I'd be awful grateful. This meeting will take place in April 2063.