I've had a guest recently who booked for 10 days. We met at check in. House rules, access etc. was explained to him and I left him with a house key. The understanding was that we'd meet again at check out, for me to verify that the room/bathroom was in proper condition, collect the house key and to see him off. We exchanged cell phone numbers in case something was needed from either side. After a few days (may be 5 or 6), the gentleman just left, without a message. He would not respond to my text messages, did not return the key, and other residents say that he has not been seen in the past 3 or 4 days (no one kept an exact count). What should I do? If I need to replace the lock, who is expected to pay for it? I am a bit concerned, being a new host. Any suggestions will be appreciated. Thank you.