Be ahead of complaints. Make a schedule for regular checks of the rooms (bi-weekly/monthly). Check if curtains close well, if toilets don't have water running, if all lamps and tech stuff (like TV,...) works as expected.

By checking the rooms you can lower the complaints and get a better grip on the maintenance. It's better to have a constant, plannable repair flow, than to have an emergency fix in the middle of the night, causing extra costs and annoying your customers.