Spain is not asking international visitors, neither for short or long periods to undergo any kind of quarantine.
The main indications are available in this link, please note that it includes specific indications for Aragón.
Mainly the mandatory use of masks both in the street and inside areas. So mask, distance and hygiene are the main indications to fight this disease. At home please take ventilation seriously as it is considered important to keep fresh air at home.
Also one of the main recommendations is to avoid gatherings and meetings (specially in closed areas) with people outside of the regular coexistence. Therefore parties or big meetings at home are seriously discouraged.
Please protect yourself and the people you are living with in order to take the maximum of your experience in Spain.