I spent a few days in Mary's house having the ensuite room for myself. Nice room with space and also a table available to work if you need to.
Mary is very kind and welcoming and the breakfast was excellent. 20 minutes walking from Malahide Dart station (if you need to take the train towards north or south).
I really like Malahide so for me staying at Mary's was ideal.
Quiet area so if you need to rest it's perfect but very close to the village so if you want to go to the supermarket/pub/restaurant you have everything nearby.