Dang, I am stuck in the Giovanni Mansion.. I've read other problems people have had, but they seem to have found a way around it. So I've entered the mansion, and I can't activate this dirty secret quest, I assume my seducing skills are not up to par. I read that you can skip it, by going into a library room to the right when you first enter the mansion, but my lockipicking skills aren't up to par I guess. So do I just have to go and find some side quests and get some xp before trying the mansion again?
In the hall between the wooden door and wall there are entrances to secret passages. Follow the right one to the end and you will see one Giovanni guard activate secret passage to catacombs.