Simple enough: Lámpás is a a dimly-lit, labyrinthine, below-ground bar where you can find live rock/jazz/blues performances almost every night of the week. Oddly, this gritty, and by no means mainstream bar is opposite Gozsdu Udvar, a tourist-heavy area teeming with pricey restaurants and wine bars. Lámpás, where you can get a beer and a fröccs for €3, feels a world away—a little gem in the midst of it all. The crowd is usually a good mix of local and foreign twentysomethings.
If things get too heated and cramped in the concert room, look for a table in the back of the space, which caters better to conversations. Note that Lámpás scales back their operation during the summer months.