There are situations where a lease between a landlord and tenant does not address the access for a landlord to the unit. Florida Statute 83.53 states that a tenant shall not unreasonably withhold consent to the to the landlord for entry of the unit for multiple reasons. The landlord must however give reasonable notice, which is typically at least 12 hours prior to the entry, and must be in a reasonable time period, between 7:30 am and 8:00 pm.
The statute makes sure to forbid a landlord from harassing a tenant by abusing the right of access. If there is a question of whether or not using the right to access for a landlord is harassing, look at it as a third party who is neutral on the situation would, and ask if the request for access is unreasonable and is there a valid purpose for the access.