Even on a tight schedule, Monastiraki & Flea Market earns the hours.
Allow 1–2 hours.
Monastiraki is pure Athens energy: a chaotic market spilling down Ifestou and Avissinias, the Acropolis framed above the square, and great rooftop-bar views over the rooftops. The catch: it's pickpocket-y and relentlessly busy, much of the 'antique' stock is mass-made tat, and the real flea market only really comes alive on Sunday mornings.