A nice apartment in Clongriffin, small and comfortable. If you're using public transit, perhaps the best option to get there is Dart train to Malahide and be careful with departure times and platforms. If you need to get from the apartment to the airport, I'd recommend public transit rather than taxis, as taxi fares from Clongriffin are around 30 euro, while we spent around 10 euro (per person) on the Dart train and Airlink bus (together).
The apartment itself has access by stairs and elevator, which is great if you're carrying heavy luggage. The bedroom was tidy and comfortable, with the added bonus of an electric tea kettle and a selection of teas and instant coffees.
Yvonne was a nice host, who welcomed us and was easily reached by phone for directions and any other questions we had.