I suppose the first factor would be WHERE you expect to live. Would you want something beachfront, a tiny village, San Sebastián-Donostia, Barcelona, Madrid, Seville, Záfra, Cambados, or something near the French border? You'll find VASTLY different rental prices from one to the other.
Do you want upscale neighborhood? Working-class neighborhood? Historical district? Suburb? More factors in prices here.
You'll find discussions on working in Spain in the ..ummm... "Working in Spain" forum.
Saludos, MadridMan
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