If students use qualified brokers (whose role can be verified by asking them for a Chamber of Commerce certificate), before signing any document they should enquire about the amount of the commissions requested by the agents and ask to sign the lease agreement only in the presence of the owners, after checking their identity document and, if possible, their title of ownership or, at least, proof of availability of the property. The form must also clearly states which are services included in the commission and which are excluded, write it down.
The commission is a mediator's right, therefore, be careful of professional services at zero cost, because they often hide abusive or, in any case, deprived services of guarantees for customers.
Good to know:
The mediator has the right to get his commission on both the landlord and the tenant, this is a guarantee of neutrality and impartiality of the professional.