NO. That is absolutely NOT the way to do it in Thailand.
Never accept the asking price.
Renters will almost always come down in price.
Make sure there is a tight clause in the contract for the return of deposit.
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Considering this is far less time of a usual lease you loose the advantage of negotiation, as for return of the deposit there is a standard lease currently in use that covers the return of the security deposit.
"In the land of the blind the one eyed man is king"