The first thing I would ask for is that your room stay is coded "RFB" so you can sign restaurant meals to your room and they will be comped. If you can get that without much resistance, I would add a request for a transportation reimbursement, where they give you a cash payment at the cage in the amount of your round trip airfare. I would not ask for this first, since it is much easier for the host to give you restaurant $$ than actual cash $$.