How does a voucher work? It is basically like crediting an account for one year. When you purchase a voucher, you receive a code you’ll fill in during the booking process. Anyone can use the voucher to book a night at the Anybody!
As the prices of rooms depend on the season and occupancy, it is quite possible that the credit on the voucher won’t match exactly the price of the room chosen by the voucher holder. If the credit is higher, you can use it to book several nights at the hotel, even on different dates and for different guests. If the amount of credit is too low, the balance can easily be paid by usual means.