It is not illegal to rent to people with mental health issues. However, noise of the nature you describe can indeed be considered an interference with quiet enjoyment. Use the Find A Lawyer tab on this website to find a reputable tenants rights attorney in your area who can advise you how best to proceed.
The information provided herein is general information only and not legal advice. The information provided herein does not create an attorney client relationship and is not a substitute for having a consultation with an attorney. It is important to have a consultation with an attorney as the information provided in this forum is limited and cannot possibly cover all potential issues in a given situation.
The landlord may be interfering with your quiet use and enjoyment of the property. I recommend writing a letter to the landlord outlining all of your concerns so that the landlord is on notice of everything that you are subjected to and sending it certified mail. This helps your case tremendously in the event that your case has to go to court.