I just used this bus and learned a few things I wish I had known earlier.
First, it took a little bit of work to find the correct location. I blame this on a sleep deprived brain! You should walk to the first island for buses and turn right to B11. I had read that you could buy your ticket on the bus. This is only true on your way to the airport. At the airport you need to look for a bright red van parked nearby and buy your ticket before the bus comes. You may board the bus through any door once you have your ticket.
There is an excellent display showing the next stops so if you know the name of your stop, you should do fine.
I hope this helps someone else