Landlords have an obligation to maintain the covenant of habitability. They are not allowed to disclaim this obligation. Arguably, the landlord is violating this covenant by failing to take corrective action for the issues you mentioned. You should document all of your requests to the landlord in writing and perhaps make a complaint to the city or county health department. You may want to investigate the "repair and deduct" remedy as well which allows you to repair the deficiencies yourself and to deduct the cost of repairs from your rent. However, there are some limitations in utilizing this remedy and you should contact an attorney to provide you with legal counsel.