Jenny's Apartment is a location featured in The Darkness.
Jenny's Apartment is number 11 in an apartment building at Chinatown. You will need to go there at one part of the game. When you go there you knock on room 11's door and Jenny will open for you.and you walk inside and have a talk with her. You tell her that you are a hitman but she doesn't believe you.
Instead she asks you to come sit down next to her on the couch and watch To Kill A Mockingbird. Also at another part of the game if you go to her apartment and knock on the door, The Darkness will appear and laugh (hinting that it knew about Jenny being kidnapped).