The management better do something about this. Send a certified letter to the management with witnesses signing also. Keep a copy. If something happens, they can be held liable big time. But you don't want anything bad to happen, so call the management EVERY time it happens. Let him get violent with them or the cops. They have to see it in person. Then they will probably smell that smell and it will take it's own course. DO NOT go down and knock his door. He will blame you because you knocked before. You don't want retaliation when he gets busted or kicked out. Record the music coming through the walls. Record any conversations he may start with you. I also recommend self defense classes, and do not say you bought the gun for protection from him. I used to manage property for six years and had two nuts like him. We got one busted, and the other one tried to beat me up one night. He got arrested after I cleaned his clock with some self defense moves. Keep witnesses around you until he or you are gone. If you smell that smell, call the fire dept and tell them you smell smoke. They will add to the witness list and the cops will respond if they call. Sounds like you have some lousy cops, you might want to chat with their commander. You might consider a small 9mm or .38 . Go to the local range that rents them so you can get a feel for it. If you pull heat make darn sure it is life threatening.