petra was in my old neighborhood and i always tried to stop by but never found it open (summer hours!). after a great article came out on petra in the guide istanbul, i thought i'd give it another try, but this time i tweeted petra about their hours. in return, i got a tweet, an invite to come introduce myself, and a free coffee! i stopped by on sunday (new fall/winter hours) and found the place packed for an event. for my free coffee, i picked out the first cold brew on the menu which came in a high ball glass with a nice big chunk of ice. the cold brew was excellent which was particularly pleasing because i had had high expectations for petra and they delivered effortlessly. great customer service, a quality product, and an artsy atmostphere.