Unless you are retiring and looking for a quite life, I dont think Castlerea has much to offer. It has not changed in 40 years, having visited it afew times recently after a long period away. There are no restuarants at all, except for a pub lunch type fare in a run down hotel, so Im told you have to drive to either Athlone or Galway for a decent meal out!
I looked, but could not find a single place to have a coffee there, except in pubs. Its 2.5 hours from dublin in zero traffic, so hardly commuting distance. Despite these comments, some people may like it, but they probably live there already.