I think it really depends on the type of apartment you want to rent and most importantly, the location. In Spain, tourists concentrate around the coast for beaches within walking distance. After I sold my house in Torrox (East of Malaga), I needed to be there last February for the paperworks, and I rented a private studio with 1 bedroom that cost me 800 Euros for a month, including water, electricity, and internet; it is a few steps from the beach and to all amenities One can always talk for a discount particularly if you know the owner.