There are two different types of deposits: Security and Holding deposits.
By clicking on the Deposit section under the Rental conditions, you will get more information about each type of deposit.
The holding deposit is the amount you will pay at the moment of the booking with the intention of making a reservation. This deposit is paid via Uniplaces and transferred to the landlord as soon as the booking is accepted. After your booking is accepted, if you decide to cancel it, this deposit will not be refunded.
After the move-in, this deposit will be transformed into a security deposit, to cover for damages or early departure. If no damages occur, and you leave on the agreed move-out date, the deposit should be refunded in a way you both agree on. Find more information about the security deposit here.