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. Lunch in Borgo Pio, NOT in the streets right next to St. Peter's Square. 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
1) Drink from the nasoni (free public fountains, water is excellent — 2,500 across the city). 2) Buy a 72h Roma transport pass (€18) only if you'll use metro/bus 4+ times per day, otherwise pay-per-ride (€1.50). 3) State museums are FREE on the first Sunday of the month — but expect double the crowds. 4) Many churches house masterpieces (Caravaggio in San Luigi dei Francesi, Michelangelo in San Pietro in Vincoli) for free.
The 5 mistakes that ruin a Rome trip
1) Renting a car — Rome's ZTL zones fine you €100 per camera crossed, even with rentals. Use metro + walking. 2) Eating on Via del Corso, Piazza Navona, around the Colosseum or Vatican — guaranteed tourist trap, €25 carbonara from frozen pasta. 3) Not booking Colosseum/Vatican in advance. 4) Taxi from Fiumicino without confirming the €55 fixed fare (it's regulated). 5) Underestimating walking distances — wear real shoes, Rome's cobblestones (sampietrini) destroy thin soles.