If you are looking for a car parking in the heart Rome is rather difficult, specially in the Trevi Fountain area, the Relais is located in a restricted traffic zone only for resident, taxi and cars that have special permission can enter in the area.
We can suggest you this nearest public parking: Parking Ludovisi in Via Ludovisi 60 tel. 06 4740632, near Via Veneto or ParkSi Villa Borghese entrance from Viale del Galoppatoio 33, Tel. 06 3225934
The restricted traffic area in Rome's historic centre is closed to cars during the following hours:
Weekdays: from Monday to Friday: from 06.30 am to 6.00 pm - Saturday: from 2:00 pm to 6.00 pm
Cars without permission to enter may access the restricted areas during: Sunday and public holidays - Weekdays from 6.00 pm to 6.30 am the next day