Coming on the property and entering a premise have different sets of rules. As far as stepping on th elot they can to provide maintenance, repair or complete an inspection. As far as entering the preise, in most states the law states a minimum time frame and in others states shall gove a reasonable notice. Miost people think 24 hours is a reasonable notice. The exception is in case of an emergency they can enter without notice to make repairs to preserve health, safety or damage. The best advice is to keep communication with your landlord open and discuss your concerns and provide them with your concerns.