This booking request was formally confirmed with the guest via AirBnb shortly after sending the initial message. I promised to get back to them later, as I did to confirm the booking, so there was no need for him to "loose hopes" [sic].
I sent two further courtesy messages to enquire whether the guest had any special requirements for breakfast, and to ask what arrival time suited him. The guest never responded to any messages, never turned up for check-in, did not signal that he had made a reservation elsewhere and made no attempt to cancel this reservation, until the day after check-out.
The guest's "bad experience" arose due to his total lack of communication and his failure to properly understand the Airbnb booking process. Please see below for feedback from guests who actually stayed here.