Are you an EU Resident or a UK REsident?
The issue is what costs do you expect to cover? Community and other fees vary between communities, especially with the cost of pools, garages, lifts and gardens on the apartment blocks.
Summer rentals can be good - August Spanish holiday are busy and hot. Off peak rentals can be very low and with the visits limited to 3 months from the UK over-wintering is not as popular.
Non EU residents have top pay a 24% tax on gross rental income, EU residents pay 19% on net after expenses, which is a significant difference.
Any rental income should be thought as a contribution to costs, not a profit.