Day 1 — Ancient Rome (Colosseum, Forum, Palatine)
Start at 08:30 at the Colosseum with a pre-booked timed-entry ticket (the combined Colosseum + Forum + Palatine pass costs €18 and is valid 24h). Doors open 09:00; arriving 30 min early means walking straight in instead of queueing 90 min in the sun. After the Colosseum, walk uphill to the Palatine, then descend into the Roman Forum — exit at Via dei Fori Imperiali around 13:00. Lunch in Monti (5 min walk) at a non-touristy trattoria — avoid anything with a multilingual menu and photos of the dishes. Afternoon: Trevi Fountain → Pantheon → Piazza Navona, all walkable in 90 minutes. Aperitivo at 18:30 in Campo de' Fiori.
Day 2 — Vatican (St. Peter's + Museums + Sistine Chapel)
The Vatican is the part of Rome where 'just turn up' fails hardest. Book Vatican Museums tickets online (€20 + €5 booking fee) for 08:00 entry — by 11:00 the queue is 3 hours. Plan: Museums + Sistine Chapel first (3 hours), then exit through the back door directly into St. Peter's Basilica (free) skipping that queue too. Climb the dome (€10, 551 steps or €15 with elevator+steps) for the best view of Rome. For lunch, walk a few blocks away from the basilica — the further you get from the high-rent streets facing the square, the better the price-to-quality ratio. Afternoon: walk across to Castel Sant'Angelo, cross Ponte Sant'Angelo at golden hour for the postcard shot.
Day 3 — Trastevere, Jewish Ghetto, Aventine
Slower day, more local. Morning at the Jewish Ghetto: try carciofi alla giudia (deep-fried artichokes) at Nonna Betta or Ba'Ghetto. Walk across Ponte Cestio to Trastevere — wander Vicolo del Cinque, Piazza Santa Maria. Afternoon: walk up the Aventine Hill (10 min uphill) for the Orange Garden viewpoint and the Aventine Keyhole (free, 30 sec wait). Sunset at Gianicolo terrace — best free panorama in Rome. Dinner in Trastevere but BOOK ahead: Da Enzo al 29 (book 2 weeks in advance), Tonnarello (no booking, queue 19:00 sharp), or Da Teo.
What to skip on a 3-day trip
Catacombs (1h round trip outside center for a 30-min visit), Borghese Gallery (worth it but eats half a day, requires booking weeks ahead), Appian Way (needs a full day), EUR (modernist architecture, irrelevant for a first visit). Save these for a second trip.
Practical money-savers
Tap water is genuinely excellent in Rome, so bring a refillable bottle and drink from the nasoni (the small public fountains dotted all over the city, about 2,500 of them). Skip the 72h transport pass (€18) unless you're planning to use the metro or bus more than four times a day; individual rides cost €1.50. State museums are free on the first Sunday of every month, which is a real treat, though crowds roughly double. And many churches hold masterpieces by Caravaggio and Michelangelo that are completely free to see.
The 5 mistakes that ruin a Rome trip
Renting a car tops the list: Rome's ZTL zones hand out €100 fines per camera crossed, including rental cars, so just use the metro and your feet. Eating at the restaurant with tables literally facing a famous fountain is the next one to avoid, since that visible real estate comes at a premium and the kitchen pays for it somewhere. Book the Colosseum and Vatican well in advance, especially in summer, or you're looking at two-hour walk-up queues. For the taxi from Fiumicino, confirm the €55 fixed rate before you get in (it's a regulated fare, not a negotiation). Finally, pack real shoes: Rome's cobblestones will ruin thin soles faster than you think, and you'll be walking a lot more than expected.