Hi, I’m visiting Istanbul next month and arriving at Sabiha Gokcen. My hotel is in Sirkeci, the easiest way to get there seems to be the E10 public bus or Havatas shuttle bus to Kadikoy and then the ferry to Eminonu. As I am staying for a week, I will get an Istanbulkart – is it possible to get one at the airport or at the bus station outside?