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Flohmarkt by the Naschmarkt
This flea market features everything you can think of. From the traditional antique furniture collector that displays his treasures, to the art nouveau dealer specializing in jewellery, to excellent paintings (usually forged copies that are very well done)....you can find everything.
It is also a great place for souvenirs and 2nd hand clothing (you will find a lot of traditional Austrian type of clothing here), but also the usual 'junk' sold at flea markets across the world....
Just make sure you are there early enough - stalls open around 8.00am - no worries, there is plenty of cafes and restaurants around where you can have breakfast after a great shopping spree....really worth checking it out!