Guests: Proceed with caution. Have a back-up plan.
Below is what I wrote to the host(s), verbatim.
How to improve hosting:
Do not list a property that is unable to be secured by functioning door and window locks. Putting furniture in front of the door, blocking a stairway, and having a dog in the courtyard are not acceptable substitutes for fixing an exterior door that will not lock.
Only the host should call the guest's phone number. The husband of the host is not the host. Neither the host or the host's husband should be verbally intimidating to the guest.
Do not type into the Airbnb messenger that all is fine 9 minutes after your guest handed back the key because you were unable to show the guest that the exterior door does lock, and unable to lock the windows. Instead, contact a repair person and contact the guest once repairs have been completed. Be honest. When you have provided an unsafe property to a guest with children who has driven 12 hours immediately before arrival, assist her in finding a safe, secure place to stay the night, and if the repairs can not be completed in 24 hours, REFUND THE STAY.
How to improve the property:
Unblock the back stairs. Do not leave a dog in the courtyard. Do not block exits with furniture. Clean the mold above the bathtub and below the newer tile. Replace the exterior doors, locks, and doorjamb to ensure the property is secure. Replace or repair the windows so that they lock. Provide keys to open each exterior lock. Remove the broken key from the deadbolt on the wooden first floor exterior door.