The meeting point is straightforward to reach. Piazza Del Popolo is at the underground station "Flaminio." Your private guide will be waiting in the center of the Square at the Fountain with the four lions surmounted by an obelisque.
Trevi Fountain area is rich in restaurants, fast food, and souvenir shops. It is only 10 minutes from Piazza Venezia, the Roman Forum, and the Colosseum.
Most bus lines cross Piazza Venezia, while the underground station is opposite the Colosseum.