Transfering in Shanghai for around 17 hours.

My family will travel to Rome in july by china eastern airlines and we will stop in shanghai 17 hs on one way and 6 hs in return way, we want to stay at a hotel because it will be at night and we will travel with kids.
We have italian and argentinian citizenship, and we got the residence here in new zealand.
I want to know if we need a visa or any transits permits.
Thanks