You have to check your keyword selection, whether your ads are getting clicks or whether it's flying out the door with no leads.
SEO is long term and PPC is short term. Try directories and websites local to Spain with content relevant to the property industry. Write articles, do
PR and link your site address.
Go to
http://www.marketleap.com/publinkpop/ to check how many backlinks you have on the site. Further check out
http://www.seocompany.ca/tool/seo-tools.html - there are some cool
SEO tools to get you on your way...
Regards
MtraX