Start where Emily lives: Place de l'Estrapade, a small square behind the Panthéon in the Latin Quarter, with the bakery she loves on the corner. Café de Flore in Saint-Germain, where she meets Thomas, a literature professor, is about 20 minutes away on foot. Around the corner, Emily ends things with her boyfriend on the phone in front of the Panthéon in episode 2, and the Luxembourg Gardens, where she goes running, are about 10 minutes away on foot. Just off the square, Café de la Nouvelle Mairie is where Emily and Mindy meet for brunch and gossip; it is closed at weekends.
In Paris, the rest is spread across the city: the Palais Royal arcades where she walks in slow motion, Pont Alexandre III where she interrupts the shooting of a perfume ad, the footbridge on Canal Saint-Martin where she has her heart-to-hearts. Give it two days, or one area per morning.
Later seasons also take Emily to Italy. In Rome her flat looks onto Piazza Mattei, close to the Theatre of Marcellus, and the series returns to the Trevi Fountain, the Spanish Steps and Piazza Mincio. The Square Colosseum is in the EUR district, a metro ride south, and Ostia Antica is a half-day trip by train. In Venice the scenes are around the Hotel Danieli and on the Rio Marin. In the Plan section, choose Rome or Venice to plan that part on its own.
Emily's square is 100 metres from the room where the young Hemingway went to write: A Moveable Feast walks the same streets a century earlier.