In September 2008 I surprised my wife by making her "The Queen of Bologna" for a night complete with "her" tower and a party for some friends. What a wonderful night we had. The owner was very helpful with setting up the food and drink and for getting the harpist to come and play. A wonderful, magical, romantic night.
I would highly recommend doing this for something special - after all how often can you have a 12 story, almost 200' tall tower al to yourself? While pricey, it is a unique opportunity and a very unique property. The rooms are comfortably furnished. The roof offers unparallelled views over the rooftops of Bologna - all the way to San Luca. All in all, well worth it.