DCDuncan has given me some hotel suggestions for Rome ... most (like the Crowne Plaza at St Peters, Rome Cavalieri Hilton, Exedra A Boscolo Luxury Hotel, and the Hotel Pointe Sisto Roma) will not quote prices until 50 weeks before your dates of stay. The two that would quote me prices were:
The Castello della Castelluccia
for 2 people in a room is approixmately $1,099 USD (based on currency conversion) for 3 nights post cruise.
The Hotel Aldrovandi Palace
for 2 people in a room runs between 410EURO to 480EURO per night (based on today's currency conversion that would be about $615USD to $$720USD per room per night)
I also checked with some others and these are some prices that I found (based on 2 people in the room):
3 star hotels
Brasile 3 nights $587USD
Kennedy 3 nights $597USD
Diplomatic 3 nights $657USD
4 star hotels
Mondial 3 nights $582USD
President 3 nights $602USD
Residenza Antica 3 nights $602USD
Royal Santina 3 nights $602USD
All prices are subject to change, and are based on availability, but this gives you some ideas of what kinds of prices we can be looking at in Rome. As of right now, I have not been able to get a hotel to commit to group space (I need to provide a solid number of rooms that we need), and that can affect pricing as well.