I found that the best thing to do is to write a public answer so that new potential guests can see how you dealt with what happened. Keep it short and to the point, nobody will read a 3 paragraph response.
@Marilyn87 I think the cutoff time for posting a public response to reviews is 30 days.
Based on the state of your listing I think you're better off deleting it and starting over. The old reviews will still be attached to your profile, but an unreviewed listing will attract more bookings than a low rated one with lots of host cancellations.