David was totally unresponsive the morning that we were supposed to check in. I tried contacting him by message and by phone beginning at 10 AM the morning of check-in; I am writing this 2 days later and still he has not responded. We were given the key-code in advance, and showed up at check-in time to a unit that had not been cleaned from the guests the night before, who we actually walked-in on during the day, as they had not yet checked out. David said he lived upstairs; we heard someone in the unit above us and tried knocking, calling, etc., but never got an answer. I contact AirBnB support and they were extremely helpful and kind - can't say enough about how generous they were! We booked with someone else that night; even had the unit been cleaned, at that point we did not feel safe knowing that the code to the door lock/keypad does not get changed between guests.