If you're just coming to Zaragoza for a few days, a hostel, pension or hotel is probably your best option.  However, if you have time to stay for a week or more, renting an apartment could be a comfortable and often more affordable option.

APARTAMENTOS LOS GIRASOLES   
Address: Avda. César Augusto, 27        
Telephone: 976 46 92 00    
Email: informacion@losgirasoles.com     
Website: www.losgirasoles.info