Edinburgh's Fixed Fee Lettings and Property Management Agency. Win Win Property Management was born out of the belief that the only way for a relationship to last the test of time is to create a Win Win and we deliver this by being honest, fair and giving value. With a Fixed Low Management Fee of £45 per Month, we can create a Win Win. NO INFLATED COMMISSION √ The value of rental income does not influence the work to let, or manage, so why pay more? Traditionally commissions have been a percentage of rental income, get a fixed rate for your property, get better value.