Do you have free transfer to the 4 parks? And if so, do they have different frequencies? Thanks

All transfers are free. I have combed rooms on Airbnb and I have not paid anyone for the transfer

The transport is free for all those who stay in the hotel towards the 3 parks of universal studios. They have buses that go from the hotel to City Walk. From City Walk you walk towards Universal Studios or Island of Adventure. The hotel also goes to Volcano Bay and is right next to this park.

It has transfers to the 3 universal parks (Studio adventure and volcano)

It all depends on the package you take when you go to the resort