Old Comrades (The Witcher 3: Wild Hunt)

Play cards with Zoltan.

And where can I find this Zoltan (I rummaged through the Internet, everywhere "play with Zoltan")?
upd
I found everything, it's Cleaver

Gringo87
Zoltan is not Cleaver. Zolton is your old comrade and friend and Cleaver is 1 of the 4 kings of the underworld. Zolton can be found in Buttercup's tavern, he's something like a bouncer there

It's not so important anymore, the main thing is that I found it, but thanks anyway