11th arrondissement
There are plenty of bars and other nightlife locations to visit here, and it is a district filled with partiers. Like any other part of Paris, though, it still has its culture, so you should head on over to the tiny Musée Édith Piaf, to get a feel for the life and times of the famous Édith Piaf. You'll have to make an appointment, though. If you're not a fan of her singing, maybe architecture is more your thing. In that case, there are plenty of beautiful churches to look at.