Just my two cents on Oideas Gael:
I took a long weekend course there a couple years ago and had the time of my life. I stayed in a bed and breakfast with an Irish family (bean an tí agus a fear ceile). They were wonderful and the food was great! Probably the best thing was that there were other students at the bed and breakfast and one of student-guests, Roisín, became the informal leader of the gang. She was fluent in Irish and very helpful towards us beginners in helping with our Irish. She also kept us on track when we tried to veer off into English.
The folks at Oideas Gael are very professional and very kind and hospitable. Just tell them what your intentions are and I'm sure you'll be accomodated, as long as you register early enough.
P.S. If you like hill walking, you'll find the most breath-taking scenery in all of Ireland in the area.
www.oideas-gael.com