Let's try to narrow your request. What's your price range? Do you want/need to be near anyplace in particular? Do you require your own bathroom? Are you looking for a hotel or maybe a hostel (called "hostal" in Spanish) would do?
I'm certain you'll have a wonderful time in Spain. To help prepare yourself, you'll find this message board fully searchable. Just use simple, straightforward but specific keywords and you'll likely find many previously thread on those topics.
Best of luck and enjoy Spain!!!
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