Fly to Waterford - Kilmore Cottage is just 80 km from the airport. Flights available with Aer Arann http://www.aerarann.ie/ from UK to Waterford airport.
Fly to Dublin - Kilmore Cottage is 190 km from Dublin airport, try Ryanair, Aer Lingus, British Midlands etc.
Take a ferry into Rosslare Eurport, just 20km from Kilmore Cottage, with either Stena Line or Irish Ferries.
Lots of car hire companies are located at Dublin and Waterford airports, and at nearby Rosslare ferryport
There are always local taxis available - fare should be no more than 25 euros between Wexford and Kilmore Cottage.
Train and bus links nearby.