Hi,
I am born and bred Irish - have lived in Galway for most of my life. The Galway accent is recognisably Irish, but relatively flat and very intelligible. I can, of course, use other "more Irish" accents if that would be preferable.
I am a fluent Irish speaker, but it is not clear from your ad whether you want the voiceover in Irish or in English.
If you can provide some more details of what you're looking for, I'll be happy to send a couple of samples.
Best,
Fintan