Would it help to keep your guitar locked in a case and hidden out of sight? Like maybe under your bed or couch or even a closet? Or better yet, maybe but a lock for your closet or bedroom door too? An extra step like that would take more time and noise for a thief, could be a good deterrent. Just keep the orignal door knob around for when you move out. If they are kicking doors in you could buy similar screws that are like 4" long for the latch and hinges to reach the wood studs instead of just the frame.
Edit: that's also terrible about your neighbors.