Early AM Aircoach to Dublin airport?

Hi all-- my family and I fly out of Dublin Airport at 8AM on a Saturday later this summer, and I'm looking at options for getting the five of us to the airport by 6AM (or possibly sooner). We're staying at an AirBnB, so having a hotel hire us a taxi won't work. I've done a bit of research, and Aircoach looks like it might be the way to go-- we can get on at 5 or 5:30AM at St. Stephen's Green and be at the airport half an hour later. Can anyone share their own early morning experience with Aircoach, or make another recommendation? Many thanks.