Never though I say this but was really impressed with a car rental place. I bargained down to 50euro per day full insurance, at the Dublin airport counter so don't pay more if your getting for over a week. The Diesel Renault Megane wagon was very new, and was surprised how nice it was to be honest.
I got them down another couple of euro per day for extension so put your Irish cap on and chance your arm. A good Irish saying is never take the first price for anything...
The drop off was super easy and bus lift straight to and from airport was actually a bit of craic with the driver.
I'll use again if needed.