Convenient transfer station from SAW airport. It is possible to quickly get by ferry to the historical center. The HAVAIST bus runs to the new IST airport. Or you can just sit on the shore and eat Durum.
Transfers to the metro are paid, the Istanbul card cannot be replenished in cash. For some reason, cash can be replenished only in vending machines at the marinas
The metro station itself is like a station, ordinary, but on the surface there is excellent sea transport to the European / central part of the city, very shortens the way)))