I have found Kenny is easiest to reach early in the am. I have left messages and he or his assistant has always called us back then or in a couple of days at the latest.
I booked my spring break rental last fall knowing it was a very busy time of year.
He has never let us down once we have confirmed our trip dates with him and availability. We were a bit nervous the first rental but now I don't pass a thought on it. He will confirm a couple of days from arrival and we call him when we land and let him know what cabin we are in once we know.