Travelio charged me after I moved out. Is that allowed?

They can raise a claim; what they cannot reasonably do is charge you for it without evidence you can test. Demand the itemisation: a dated photograph from before your tenancy, a dated photograph at check-out, and the supplier invoice. Documented cases include a guest billed for a mini-refrigerator repair they denied causing, furniture damage that pre-dated the tenancy, and an electricity penalty raised weeks after departure. One tenant spent a month contesting 'missing items' despite Travelio's own staff having signed off on the unit at move-out — which is exactly why that sign-off is worth insisting on before you hand back the keys.