Car review
After…read morereading the reviews of this location, I have to say they're a little unfair. I've rented from Sixt numerous times in the States, and have always had a positive experience. I went here knowing it would be different than how we conduct rentals in America. The main complaint is the excessive hold they place on your credit card upon check in, and this seems to stem from misunderstandings.
The hold/deposit decreases based on how much insurance/excess you select. If you opt for no/low coverage, or want to use your credit card CDW, then yes, they will place a significant hold to secure the car. I opted for the €0 excess, so the deposit was only €100. I don't really blame them for this; if you have never driven in Ireland before, you WILL damage the vehicle. There is simply no room for error, and mistakes will happen. The first time I drove a car there, I ran into bushes, grazed the passenger mirror on a fence, and severely curbed the rims. Luckily, Enterprise didn't charge me for that; however, even in the States, Sixt is known for documenting every minor scratch you put on their cars - especially the locations with the AI camera arches.
Anyway, as for the experience, I arrived to the Sixt counter inside terminal 2, and was pleasantly greeted by Adelina. I provided the necessary documents, she confirmed the protection/insurance selections, provided a free upgrade, and gave clear instructions on how to get to the vehicle lot. I took the shuttle over, quickly found the car, and was on my way. I was assigned a Renault Captur, and though it had high mileage, it was clean and in good mechanical condition. I put well over 1,200 KMs on it over six days, and got decent fuel mileage.
Overall, you have to consider their point of view - renting to Americans who are accustomed to driving on the right, with roads considerably wider and easier to drive than Ireland's. As a result, they protect their vehicles for inevitable damages. Set your expectations realistically and protect yourself as much as possible, even if the protection is more than the rental; it's worth the peace of mind.