Spanish Members

Hola,
Does anyone of you have a real estate property in spain which you are renting?
My tax advisor in spain tells me that when you love in CH (meaning outside EU) i need to pay 24% taxes on the gross rent income (i.e. without the deduction of interests of the mortgage, community costs etc). Compared to spanish residents this is much much higher (spanish residents can deduct these costs and they actually also pay less % on the net income).
Anyone has some experiences to share?