Moved from Stockholm to Rome a couple of months ago and one of the things I was most looking forward to was [what I believed to be] a plethora of vintage stores that would put Sodermalm to shame (my old haunt in Stockholm where most vintage stores & op-shops are located - some expensive, most not so).
But I must say I haven't really come across a particular area per say. I saw a few shops in Trastevere but the were 1) quite pricey and 2) didn't have such a great selection:(
I also found a few near piazza Navona, picked a few things but it didn't really hit the spot. Anyway have any recommendations on other places in Rome to try?