Thanks Amoud,
Its actually really good advise, as not all agents out there can be trusted. Fortunately not all are like this as explained by Nabs.
Recently I rented an apartment seen here in QL and I paid 1/2 month comission to the agent. The way things went, made me believe that something wasn't 100% OK. The "agent" didn't want me to pay him in front of the owner (thank god, the owner turned out to be a professional company), he didnt have any ID, name card or even a receipt.
At the end, I am wondering if his "commission" wasn't added in, by his own decision or even if he is really an agent!