The most exciting neighborhood for coffee in Istanbul right now is a full 12 kilometers from the city’s center, and technically it’s not really a neighborhood. Maslak is something of an urban curiosity— a suburban financial district on the Northern edge of Istanbul’s European side. But this island of skyscrapers is also home to a booming number of specialty coffee shops— driven by the plethora of white collar office workers that populate the glass high-rises during working hours. The newest of of those shops is the latest café from roaster/retailer Petra Coffee, in the lobby of the Mudo Concept Tower….