Take the money up front, and then tell everybody just how lovely and generous your landlord is that they would give you money in exchange for such a simple request of saying only positive things about them and the property! Don't talk about anything else, just talk about how great your landlord is! So generous! And just to say nice things about them! What an easy thing to do! Why would a landlord give me money just to tell prospective tenants about how great they are?? What a sweetheart!