Day 1 — Ancient Rome
Start at the Colosseum at 08:30 (book skip-the-line tickets online — €18 combo includes Forum & Palatine). Allow 2h. Walk to the Roman Forum and Palatine Hill (90 min). Lunch in Monti neighborhood (Via Urbana). Afternoon: Capitoline Hill, Piazza Venezia, walk to Pantheon (free). Evening: aperitivo at Campo de' Fiori.
Day 2 — Vatican & Centro
Vatican Museums open 08:00 — book 07:30 entry to skip queues (€20). Sistine Chapel last. Exit toward St. Peter's Basilica (free, dress code: covered shoulders/knees). Climb the dome (€10, 551 steps). Lunch in Borgo Pio. Afternoon: walk to Castel Sant'Angelo, cross Ponte Sant'Angelo, walk to Piazza Navona, Pantheon, Trevi Fountain (best at sunset).
Day 3 — Trastevere & Hidden Rome
Morning: Borghese Gallery (€20, mandatory advance booking, 2h slot). Walk through Villa Borghese gardens to Spanish Steps. Lunch near Piazza di Spagna. Afternoon: cross Tiber to Trastevere — Santa Maria in Trastevere church (free), wander cobbled lanes. Climb Janiculum Hill for the best free panorama. Dinner in Trastevere.
Practical tips
Buy a Roma Pass (€32–€52) if you'll visit 2+ paid sites — includes free public transport. Wear walking shoes (15+ km/day). Tap water is safe and free at all public nasoni fountains. Avoid restaurants on main tourist squares (overpriced) — walk 2 streets away. Most museums close on Mondays.