The place holds sad stories but it's beautiful and well maintained. If you want to experience it better ask locals for some history or have a read beforehand.
This flea market has everything from magnets and postcards to soviet bullets. Prices are low, you can bargain but you have to be inventive to get a deal. Also it's a nice walk along the stands.
I was nicely surprised by this place, the exhibition is very interesting and bigger than I thought. Must visit in Tbilisi to have a look at the history of Georgia.