Verdict: first-time visitors who want landmarks on their doorstep should pick Centro Storico; return visitors or anyone wanting a local, bohemian vibe should choose Trastevere. • Centro Storico: the Pantheon, Trevi Fountain and Piazza Navona are all within walking distance, so you rarely need the metro — but it's one of the priciest areas in Rome and the most crowded. • Trastevere: across the Tiber, full of ivy-covered lanes, trattorias and a buzzing nightlife scene; lodging is more affordable and most top sights are a scenic 20–30 minute walk away. • Quick rule: short on time and wanting an elegant, convenient base → Centro Storico; tighter budget or a foodie/night-owl → Trastevere.