I stayied in Malahide Guest House in July 2012. Rosemary is a funny, friendly, superorganized host lady. She and her family staff are simply great and makes you feel like home. Me i had a very particular situation, and i was really stressed all that period: but thanks to Rose and her family I could "survive" to alla that external pressure and smile at the end of each day.
Everything in Malahide Guest House is fantastic: very clean and confortable rooms and superb kitchen (nothing less then what a very good hotel offers you).
I suggest you this place, it's a nice quiete little village, really close to Dublin (it's 20 minutes by train).