@Sherif30 Since you've already initiated the resolution request, all you can do is wait for Airbnb to reach a decision on your case. That can take a few weeks, and you should be prepared for the likelihood that the claim will be rejected and your guests will leave a scathing review.
To reduce the chances being in this situation again in the future, I recommend finding more ways to "guest-proof" the home, replacing anything that's easily broken or stained with more durable and affordable replaceable materials. If something like a door latch requires special instructions to operate, that should be part of the check-in procedure. But if all it took to break it was a simple mistake, I'd lay the fault more with the product design than the guest. I hope you've replaced it with something better.