Those who haven't sold, bought or leased real estate before, have no idea about all the peculiarities and nuances of such transactions. Therefore, the newbies in housing transactions try to save money on intermediary services.
They arrange their rent independently or hire inexperienced agents, who work for minimal rates. More often such approach does not justify itself and even works to the disadvantage.
But even if you only need to rent an apartment for a long term, it is recommended to work with an experienced realtor. Yes, his services cost money, but the intermediary will find you not the first option, but the most profitable in the long term.