From the airport, follow the signs/directions to Atakoy and continue straight along the sea road to Aksaray/Taksim.
If you don’t need to park, it is best to get out of the car/taxi at the Mercedes agency and walk about 30 metres as the hotel is situated on a slightly tricky corner, which means the car would have to turn through a few streets to take you to the front door and it’s not really worth it.