Visit: Sant'Angelo Castle, the Court, an overpass on the streets around the Trevi Fountain, or the church from the Piazza della Republica, Colosseum, Roman Forum, Arch of Constantine, Capitol, Castel Sant'Angelo, the Spanish Square.
The subway jukeboxes offer drinks at reasonable prices. If you want to buy in the center, find the same drink or biscuit, but overpriced.
If you stay more than three days, absolutely take the Roma PASS, which offers free visits to some tourist attractions, free transport and so on, because transport is expensive.
Free city panorama view from the Palatine Quirinal, Borghese Park or at a higher level on the Vittorio Emanuele II monument.
Doria Pamphilj Pinacoteca museum is extremely valuable, being on the same spot with the Vatican and Capitoline Museum.
Do not buy souvenirs near major sights - are expensive.
Gelato, is Rome's most wanted dessert every season. Eugenio is the oldest ice cream shop in Rome and in the world, near Piazza Venezia.
Choose to accommodate close to the center, to save some money - transport is quite expensive.
If you want to visit the Vatican, get the tickets online.
If you want to visit museums for free, go when they have the Museums Night (La notte dei Musei).
It is advisable to use the subway long distances to get faster and avoid the crowded streets.
Equip yourself with casual shoes!
The water from fountains in potable and is really good.
For shopping enthusiasts on the way Fiumicino - Rome there is a huge outlet, visible from the highway.
Don not rent a car to move around Rome, the best way to visit Rome is walking.