How To Write A Rental Agreement Letter . Some of the information that a room rental agreement letter may contain is: The letter should be inclusive of all the rights of. Rental Agreement Letter and Tips to Write Better One Mous Syusa from moussyusa.com I am writing to you with regards to emily tran and her credibility as a potential tenant at your rental property. This is the most important tip when creating a rental agreement. A simple one page lease agreement governs the relationship between the landlord and the tenant.