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@Pete69
In order to avoid that this discount hunter finally accepts Your price and then leaves You a bad review, may I suggest You double the price in Your calender for the specific days for a period of 2 or 3 days. Later, You can change Your prices back to normal.
Or You put into Your houserules: "Pls note that from month xx to month yy (the specivic dates) there will be a mayor inspection of the heating system and there will be no warm water". So if this person books, it's with cold water only. Or You have a mayor inspection of Your electric Installation and there will be no electricity. But You would provide candles for free.