I live in central Florida, 40 year resident.
Have killed 1000 roaches in my lifetime. Have de-infested rental homes myself. A properly sealed, dry, and treated home should not show more than one roach in a weeks time.
If a guest encounters more than one rogue cockroach in a week, then the host has a problem with sealed, dry, or treated. Period.
Occasionally one large one may be able to sneak in for the night, but more than that and you have a disgusting problem that requires sealing, drying, and treating. Refund $ then go seal, dry, and treat the property before renting it again.