It costs CNY20 if you take the Airport Shuttle 2 to the railway station and then walk to your hotel, since your hotel is pretty near to the railway station.

you say with two kids.i think you take taxi also same price.also you can take shuttle but with two kids is not easy ,if two kids old enough to pay the transportaion, you pay 80.
if kids too young is not easy to carry tham and take your lugages.so same you take taxi is good. and before you take taxi make sure you go to railwaystation hotel make sure is you are going western building or eastern building so that you can take one the right place and will be easy with the kids