what is the cost of shuttle service from the Guangzhou airport to nanfeng hotel

For the hotel, do you mean the one on North Keyun Road, Tangxia, Tianhe District?

If so, there is no airport shuttle bus to reach your hotel. You are suggested to take the airport shuttle bus line 2B to its terminal at GDH Huashi Hotel and then change a taxi to your hotel. The distance between GDH Huashi Hotel to your hotel is around 6.5km.