Creaking noises you can't help it, take it as a passtime hobby to tackle it. :P
Broken door handles, I've heard of it but have not had any myself. It shouldn't be too expensive to replace anyway. I guess you just have to inspect the handles when you check out the car! As for the stale smell from the AC, you can fix that easy with some Lysol disfectant spray into the AC air intake ports in the engne bay.
Check the plastic neck on the radiator for fine hairline cracks
Check the Instrument panel LED lights for faded digits/lights
Check for any rough idling or stutters during acceleration
(normal for slightly rough idling when cold)
Check all electronics, make sure they are all in good working order
Check all of the listed common faults you have seen here on the forum
Set aside a budget for replacement parts to bring the car up to excellent condition. That way, you won't be in a shock and disappointed when things start to break. Afterall you are buying a used car. Good Luck!