nilsman:

The limousine bus ticket counter (also the train counter) is very hard to miss when you come out the Arrivals exits. Most hotels have a stop arranged, so if you give the counter folks (English is okay) your hotel name they can tell you what you should do.

The bus can take marginally more time than the trains, but the lack of walking/changing trains/etc. makes the bus very convenient when staying at a hotel they service. (Again, that's most of the hotels.)

The information desk is right next to the bus/train counter, in case you have other questions as well.

-KP