Ola palomaperez404,
Outdated: The following plugins were detected by reading the HTML source of the WordPress sites front page.
contact-form-7 4.6 latest release (4.9) Update required
https://contactform7.com/
Retire http://retire.insecurity.today/#!/scan/97bc66f0b78ceac4d69d19874293cc6effb24cf64c2e38ba2b638efa2e9421d0
Not much here: http://isithacked.com/check/guardamueblesen.es%20
Wait for an avast team member to give the final verdict, as we are volunteers with relevant knowledge but we cannot unblock,
Consider also: https://urlscan.io/result/5aa6371b-cb1a-4c61-ad92-8bcbbb3fad44#summary
Con Dios,
polonus (volunteer websitre security analyst and website error-hunter)