Interested in Tipperary? Lol.
From an Airbnb host perspective, I will rent at av 6 nights a week from end of May to late August. About 10k income (it would be higher in Connemara)
But then the costs and time of cleaning, maintenance and general managing.
If someone offered me €1500 - €1800 a month, I'd probably do a deal. (I'm currently doing a 3 month rental at €1100 including everything except electricity)
So, you are probably looking for some place that the owner is not too local and would like the hassle free idea of one family. Offering 50% of what they would get from Airbnb would be reasonable.
But one issue you may find is that many periods are already booked at this point, so maybe the local estate agent is the better option