Build checks into the changeover routine
Ask housekeeping to note droppings, gnaw marks, ants on worktops or insects in cupboards and report them through one clear channel. Early reports are what keep small issues small.
Plan for empty periods
Before the villa closes for a season, empty bins, clear pantries of opened food, check for leaks and make sure drainage runs away from the building.
Keep the outside tidy
Stored garden furniture, pool equipment, cardboard and building materials give pests shelter. Store items off the ground where possible, and keep vegetation clear of the walls.