There will be no problem, but there will be moisture. You'd better get some sunshine when you come back from vacation. In addition, the dehumidifier sold in the supermarket is boxed, so you can buy one in the cupboard that can absorb a lot of water. Or just put the bedding on the bed and cover it with sheets, so you don't have to stew it in the cupboard. Anyway, be sure to get some sun when you come back.