Sant'Eustachio Il Caffè — the most famous Roman espresso
On the small Piazza Sant'Eustachio behind the Pantheon. Their gran caffè (1.50€) is whipped with sugar before serving to create a thick foamy top — order it 'amaro' (without sugar) if you want unsweetened. Same beans roasted on premises since 1938 over a wood fire. There's a queue at the counter mid-morning but it moves fast (Roman style — no lingering). Don't sit down — table service triples the price.
Tazza d'Oro — a 30-second walk from Sant'Eustachio
Officially La Casa del Caffè Tazza d'Oro, on the corner just off the Pantheon square. Most Romans consider it neck-and-neck with Sant'Eustachio (the eternal local debate). Espresso 1.20€ standing. In summer their granita di caffè con panna (slushy iced coffee with whipped cream, 3.50€) is one of the genuinely great things you can drink in Rome. Also sell bags of beans to take home — buy the 'Regina dei Caffè' blend.
Sciascia Caffè 1919 (Prati) — the Vatican-side classic
Near the Vatican, on Via Fabio Massimo. Their signature is espresso served in a cup that's been pre-coated with melted dark chocolate — they call it 'caffè eustachio' (no relation to Sant'Eustachio). 2.50€, sit-down recommended for once. Old-school polished-wood interior unchanged since the 1950s. Great pit stop before or after the Vatican museums.
Roscioli Caffè (Centro Storico) — when you want third-wave too
Different from the famous Roscioli trattoria but same family. Smaller, sit-down, specialty-coffee approach (single origin, filter brews) alongside the classic Roman espresso. 1.50€ for espresso at the bar, 5–8€ for filter coffees seated. Best place in Rome if you want both worlds in one visit — classic Italian and modern third-wave. Excellent pastries.
The etiquette: how to order coffee like a Roman
1) Pay first at the cassa (cashier), get a receipt (scontrino), bring it to the barista with your order. Most historic bars enforce this — order at the bar without a receipt and you'll be redirected. 2) Stand at the counter; sitting down doubles or triples the price (table service is a real surcharge, not a scam). 3) Cappuccino is breakfast only — ordering one after 11:00 will get you a polite eyeroll, after a meal you'll be quietly judged. 4) Don't ask for 'a latte' — that just means a glass of milk in Italian. Order a 'caffellatte' if you want coffee with milk. 5) 'Espresso' is just 'un caffè' — Romans don't say espresso, they say 'un caffè per favore'.
What to order besides plain espresso
Caffè macchiato (1.30€) — espresso with a dab of foamed milk. Caffè marocchino — espresso layered with cocoa powder and foamed milk, in a small glass. Caffè shakerato (3€, summer) — espresso shaken with ice and sugar in a cocktail shaker, served straight up like a martini. Caffè corretto — espresso 'corrected' with a shot of grappa or sambuca (2.50€, common at lunch). Avoid: 'iced coffee' as understood in the US — what Romans drink cold is shakerato or granita, not espresso poured over ice.