When you arrive to the Ataturk (International) Airport, take the airport coach HAVATAŞ (Airport to Taksim square route) which has the bus stop in front of the airport exit. Get off the coach at TAKSİM which is the final bus stop. The Nippon hotel is 100 meters to the HAVATAŞ final bus stop. (Havataş ticket price: 14 TL (4 EURO/ 5 Dollar) per indv.)
In every half an hour a HAVATAŞ coach moves from the airport station.
It takes from airport to Taksim square 1 or 1.5 hours by the coach depanding on the traffic jam.