You are answering a question to a thread that is over a year old! Great timing. And your comment
"you will not negotiate a better deal by yourself' is well BS. Think about, if the renter uses a real estate agent then the landlord must pay the real estate agent 1 month's rent for the commission. Now if the prospective renter does not use a real estate agent, then the landlord has more room to reduce the price since there is no real estate agent commission to pay. This ain't rocket science. And as far as your statement, "Moreover, agents have acces to more rentals than anyone else.", this is ridiculous since there are so many websites for rental properties. Nice try though trying to keep up the myth that real estate agents have a magical curtain containing super secret listings that only real estate agents have access too.