From either of the airports, you have two options. Get in touch and we can hook you up with a shuttle service. Sure, it might cost a bit extra, but you might as well get your Moda Drei experience started, right?
If you want to save your money for a quick beer on arrival, the municipality is running some seriously luxury coaches straight to Kadikoy from either Istanbul International, or its smaller Asian sister Sabiha Gokcen. It should only cost $5 pp.
Once you get off the bus, you might need a few minutes to take in the beautiful chaos of downtown Kadikoy, but after that, off to the hostel!
You can walk (it won’t kill you). Take a taxi (it might scare you). Or walk to T3 Stop Atiyol and then take the train to “Kilise”. That’s just three stops.