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Here is the link to the Material Safety Data Sheet: http://www.repel.com/~/media/Repel/Files/MSDS/MSDS-478-101-305-April08.ashx As you can see there is little to be concerned about if the product is not inhaled in concentrated amounts, and that is due to the hydrocarbon propellants. Once it is dry it is harmless.
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If food is dropped on the floor it is never edible whether there has been a bug spray involved or not. No one knows what has been on the floor. If a dog or cat has walked on the carpet in the past, then that is far more concerning. You can wipe off the bottom of your father's slippers with a wet cloth. No need for cleaning.
Then there is nothing to worry about. While you have no pets, a rental villa can have been host to many in the past without the carpets being cleaned. I woldn't do anything to the slippers if they are dry. The propellants have all evaporated and the insecticides are plant derivatives.