The Unofficial Patch is not really a mod, but while the default basic patch only fixes bugs, the optional plus patch restores a lot of hidden content, including new quests and new maps!
With this mod you basically get a game that is 300% better than it was on release without sacrificing the original feel of the game. The passionate and professional author known as Wesp and his many contributors certainly deserve the "Leyends" status they have gained among the many Vampire fan circles.
I couldn't even play the game before I downloaded this for some reason, but now it works completely! I also love all of the features. It adds much more depth to the game, such as deciding what your character's history was. 10/10 because it deserves it! Keep it up, man!