The first step is to notify your landlord, in writing, of the issue with the neighbor. Your landlord has an obligation to take reasonable steps to ensure your quiet enjoyment of your unit so long as you are a tenant in his building. If the landlord does not take reasonable steps, you have the right to seek damages against your landlord. You can also seek a restraining order against your neighbor if you believe his conduct will continue. If you go into your nearby courthouse and ask for the documentation required to seek a restraining order, they can explain to you the process. If you still are having trouble, you may want to seek the advice of an attorney.
Answered on Dec 28th, 2012 at 3:48 PM