Brasserie 4:20 holds a railway arch at Via Portuense 82, on the Porta Portese edge of Trastevere, marked by a neon green sign and a row of kegs out front. It has been one of Rome's serious beer rooms for years, and it sticks to a narrow brief: beer and whisky, nothing else.
The pitch is a beer bar for people who read the tap list before they read the food menu. The bar keeps around 50 beers, with 12 on tap plus cask and hand-pump pours, and the staff speak English and will walk a newcomer through the Italian craft shelf. Anyone after wine, cocktails or a soft drink should plan elsewhere, because the kitchen here is built around the kegs.
The room sits inside a brick arch with scooters parked outside and a rooftop terrace above, and it shows the sport when there is a fixture on. Beer writer Mark Dredge profiled the bar early, flagging the depth of the Italian selection as the reason to make the trip out past the market. The list rotates often, so the board rather than the menu is the thing to read on arrival.
Order the Hopburger, the house burger built with hops for a fruity, bitter edge, and pair it with whatever Italian IPA is freshest on tap. The kitchen leans on bread, sauces, olive oil and salt rather than a long plate list, which keeps the focus on the glass. For a first visit, asking the bar for a flight off the 12 taps is the move, since the lineup changes week to week.
The serving setup is part of the appeal, with classic taps running alongside cask ale and hand-pump pours, a rare sight in Rome. That spread lets the bar show the same beer at different temperatures and carbonation, which rewards a slow comparison rather than a quick pint. Regulars treat the board as a moving target and ask the staff what landed that week.
Value sits in the depth rather than the price, since a focused Italian craft list at this scale is hard to find in the city. The whisky shelf gives a second track for a nightcap once the beer flight winds down. Anyone who came for a cocktail or a glass of wine will be in the wrong room, which is the trade-off for a bar this committed to one thing.
The crowd is a beer crowd, heavier on weekend nights when the upstairs terrace opens and the football brings a louder room. Reviewers on Yelp, updated in September 2025, and on Untappd return to the tap depth and the knowledgeable staff, while noting the menu is deliberately short. The shared advice is to come for the beer, treat the food as backup, and give the staff room to steer the order.
Getting there is an easy walk from the Porta Portese market and the Trastevere train station, which makes it a natural last stop on a Trastevere crawl. Brasserie 4:20 pairs well with the other Trastevere beer rooms for drinkers building a night around Italian craft rather than cocktails.
One practical note: the bar takes cash and cards but keeps no wine or spirits beyond whisky, so a mixed group should know the brief before arriving. The terrace upstairs is the seat to ask for on a warm night, since the arch below runs warm when the room fills. Service stays patient even at the bar two-deep, which regulars name as a reason they keep coming back.
Best time to go is a weekday evening when the taps are fresh and the arch is calm enough to talk to the bar. Who it is for: beer geeks, a long tasting session and anyone who wants the Italian craft shelf explained. For more rooms like it, see our best craft beer bars in Rome guide, the wider Rome bar guide, and our pillar on the best craft beer bars worldwide.
Sources: BeerAdvocate Brasserie 4:20; Untappd Brasserie 4:20 (Roma); Yelp Brasserie 4:20 (updated September 2025); Wanted in Rome; romaweekend.com; Mark Dredge, Beer
