I need to fly to Dublin and the cheapest option is Aer Lingus. I never flow One World and I never flow Aer Lingus. (I have gold status with SkyTeam and with OneWorld but this doesn't help me in this case.)

My question is now basically: Is there anything I shall be aware off when I book with Aer Lingus? I don't know why, but some alarm bells ring in my head when I hear the name Aer Lingus. It says to me "don't fly with Ryan Air" but I have honestly no idea why is that.

Oh, and what about baggage? Is there also 20kg? What is the tolerance and how much hand luggage am I allowed to take?