finally, most apartment rental agreements require some kind of guarantee and protection against unpaid rent and damages - there are a few options to consider in this case.

a cosigner or guarantor - 'fiador' -  is the typical requirement for anyone wishing to rent an apartment who cannot provide sufficient guarantees - the fiador needs to meet a set of stringent requirements and can be held responsible for unpaid rent, properly taxes, and damage to the unit.

usually a guarantor is somebody who owns property in the city to accept responsibility for the rented unit should the tenant not pay rent, damage anything, and to cover various additional costs as detailed in specific clauses.