FROM AIRPORT TO HOTELS
You can use
1-City bus, number of 442 "ESENBOGA-ASTI" (if you stay at the Hotel Evkuran, Hotel Ayma, Doga Residance, Hotel Mola, Hotel Starton, Hotel Kent you should get down from a bus at Kızılay Bus Station which named GAMA Business Center. )
or
2- HAVAS bus (you can see http://www.havas.com.tr/en/otobus_ankara.asp if you stay at the Hotel Evkuran, Hotel Ayma, Doga Residance, Hotel Mola, Hotel Starton, Hotel Kent you get down from a bus at HAVAS Station and then you can come by taxi to hotels.)
FROM HOTELS TO H.U. CULTURE AND CONGRESS CENTER
These hotels are within easy reach of the Culture and Congress Center so you can use taxi.
Taxi price is approximately 8,00 TL or 10,00 TL.