It's lovely to hear that you and your husband are looking to renew your wedding vows here on the island of Ireland!
We have several posts already on weddings which have some excellent links to places to find information both on weddings and vow renewal.Vows / Marriage in IrelandWeddings in IrelandRenew our Vows
We have an article on unusual accommodation
that may give you some food for thought on places to stay and therefore possible venues. We also have an approved accommodation search page where a search for self-catering or historic houses
again may be an ideal place to start.
Also, are you looking for a celebrant
to complete the vow renewal or something a little more low key and just say the words you alone have created?