Need a travel from Pudong Airport to People's square

Hi, I am going to be in Shangai for a week's time. Need to travel from PuDong Intnl airport to People's square (I will be staying at Marriott City centre hotel). Is it advisable to take Metro ride between the two places i.e. airport to hotel. My worry is I will be having the BIG suitcases with me, whether in Metro the luggages are allowed or not? This is what I wanted to Understand. Someone, please address this query.