Good cleaning checklists are set up to test quite a few of these things. Turn TV on/off to make sure remote works, turn AC on/off for the same, flush the toilet

Good cleaning checklists are set up to test quite a few of these things. Turn TV on/off to make sure remote works, turn AC on/off for the same, flush the toilet, run the shower, open the windows when you enter and close the windows when you leave, etc. Stocking the minifridge also functions as a check that the fridge is working, and so on. The maintenance team has an even more thorough checklist for preventative maintenance. But yes, guest reports are critical as well. You can elicit feedback with a simple "how was your stay? / how did you find the room?".