La Latina is best on a Sunday, when the Rastro — Madrid's flea market since the 1700s — pours down the old tanners' slope and the whole quarter turns out for it. But the trick is to use the market as a beginning, not an end, and climb up out of it into the oldest, quietest part of the city. Just under three kilometres, with lunch built in.
Start at Plaza de Cascorro before the crowd lands and follow Ribera de Curtidores downhill through the stalls — haggle on the junk, browse the antique courtyards at the bottom. Then turn your back on the noise and climb west to San Andrés, where Madrid's patron was first buried, and into Plaza de la Paja, the medieval market square that predates Plaza Mayor. Sit a while; almost nobody up here came from the Rastro.
The reward is Cava Baja — the castiza (old-Madrid) tapas street, one bar to the next. Order a plate, drink a caña, move on. End at Plaza de la Cebada and the iron market hall, two minutes from the Metro.