The Robert Treat Hotel provides free shuttle service to and from the airport. At the airport, take the monorail train (AirTrain) to P4 to take the shuttles. The hotel shuttle picks up guest at that location on the hour and half past the hour. It is a white van labeled as Best Western Robert Treat Hotel. (There is a second Best Western at Newark Airport; do not take their shuttle!)
The Hampton Inn and Suites at http://www.hamptoninnandsuitesnewark.com/ is less than one mile from the campus.
Hilton Newark Gateway is right next the Newark Penn Station.
See here for information of other hotels.