In reply to climbercool:
after unsuccessfully spending the last few weeks searching air bnb, gum tree and idealista trying to find a cheap rent in Spain I finally found this website which is perfect, it has thousands of houses in spain for less than 400 euros a month! Idealista and gumtree were no good because it had thousands of cheap rentals but nobody wanted to rent for less than 6 months i contacted about 40 people, air bnb was no good because none of the houses offered a good discount if you were staying for more than a month, you typically got just a 10% discount from the nightly rate. anyway this web page is perfect!
https://www.longtermlettings.com/find/rentals/Spain/
if anyone is looking for a cheap extended trip in spain this is the site!