If you plan on staying out late, just know that after 1 am on a weeknight (Sunday–Thursday), Berlin’s U-bahn and S-bahn trains shut down. To get back to where you're staying, you'll have to catch a night bus (designated by "N" before the number, which often corresponds to the subway line it replaces). These buses come infrequently (every 30 minutes) and often don’t stop directly at a station entrance, so be prepared to do some searching. On Friday and Saturday nights all subway lines (except U4) run every 15 to 20 minutes throughout the night.
For the latest information on Berlin's house, electro, and hip-hop club scene, pick up (030), a free weekly. For more general information on performing arts and nightlife, the weekly Berlin magazines Zitty and Tip are good resources.