My husband and I will be taking a trip in May and starting in London then flying from London to Ireland. We will arrive in Ireland on the morning of 17th May and will hire a car. Our return flight is out of Dublin on the morning of the 22nd, so we'll have about 4.5 days. We know it's not nearly enough time, but we are not taking our children on this trip so 11 days of sitters is all we can manage at this time ;)
We know our last full day (21st May) will need to be in Dublin. We were thinking of flying RyanAir from London into Cork and hiring a car there. Then, perhaps a half circle from Cork, up and around the West Coast and then across to Dublin and retuning the car in Dublin City centre as soon as we arrive. But, we're open to flying in somewhere else if it makes more sense.
We like the idea of staying at B&Bs instead of hotels for the most part.