Information about requisites related to COVID-19 in order to travel to Spain can be found at:
COVID-19 info to travel to Spain
In Spain is mandatory to wear face masks (surgical, FFP2, N95, etc.) indoors in public spaces (meeting rooms, restaurants, etc.) and keep physical distance (1.5 m).
Vaccination or recent negative PCR proof are required to access restaurants and bars. (measure no longer valid since 22/02/2022)
More info can be found at:
General COVID-19 info in Valencia
Regular updates are to be expected.