Hi EsMercadal! Welcome to our little message board!

While we can't know for sure what's happening in this case - it may very well be full on that day - but many owners of "hostales" prefer to say "we're "full" instead of "we don't take reservations that far in advance." I think this mostly applies to the smaller establishments the size of Hostal López . I'd be willing to bet that if you called back 2 months in advance of your intended stay that you'll find they may have a vacancy as I've never heard of a lodging establishment denying patrons a 1-night stay. 1-night is definitely better than 0-nights!

Saludos, MadridMan