Monastiraki. To the north of Plaka Monastiraki area is located. It has a lot in common with a bazaar, when hundreds of tradesmen bring their goods for sale. The market itself is situated on the Avyssinia Square and on the streetnearby (it’s a little bit westerly from Monastiraki Square).
The Monastiraki flea market is the place to be on Sunday when it seems every Athenian is here either buying or selling. You have to get here early because after about 11am the crowd becomes impossible and if you want to take a break there are few tables available at the many cafes and restaurants in the area. You can wander around aimlessly or you can find someone who knows the flea market who can show you around if you are intent on buying something in particular. Much of the flea market is not really a flea market. It is a collection of small shops of which most of them are tourist shops. These are open normal shop hours and you can come here anytime. But weekends and Sunday in particular is when it is like a third-world flea market with people selling anything from antiques to what you might call useless junk and it goes on forever, beyond Monastiraki and into Thission and Psiri.