Hi Vida,
The place that comes to my mind is The Hollies in West Cork.
http://thehollies.ie/ Thomas and Rike are two German friends of mine who live there and were among the first families to start it up.
Here's a link page to other sites around Ireland that may be of interest as well.
http://www.permaculture.ie/links.html I did a Permaculture course at Cloughjordan Eco-village last year and loved it, worth a visit, but possibly best done in conjunction with a course or work of some sort to get an easy introduction to the village there.
All the best with your trip.
Féidhlim