Woah, be careful there Debra. The NPPR (second home tax) is only valid for properties from 2009 to March 2013, but make sure you get either a declaration of payment, or cert of exemption because if he never paid (whether he knew about it or not) the full cost is now over 7000euros.
It's easy to say certain taxes are not more than taxe fonciere here - but you have to pay privately for things like tv licence and bin collection, and now of course property tax and water charges.
You will also need to research house insurance, as it could be high regarding location, and of course it being a holiday or rental - that changes everything for the insurance companies.
The bottom line is, along with everything that has been said on this thread (all true) you pay heavily for the privilege to live or holiday in Ireland - there is no cheap way to do it, unless you have a van you can put on someone's farm. It's also part of the reason I left last year - we have gone totally MENTAL!!! Not the Ireland I grew up in, and not the Ireland I want to live in right now.
Having said that, nowhere is free of corruption, charges, taxes etc etc, so you really need to go there and spend at least a few days to get the feel and weight it all up. I find as a foreigner here in France, I get special privileges, and never have to get deep and dirty about politics, or even the very local stuff - everyone gives out about where they live, or grow up, at some point.
You will buy easily in Ireland, but to sell on....good luck with that - I am just coming through that process - it is extremely painful, and will not improve in next 10 years minimum, possibly as someone else suggests, our lifetime. My generation caused it (the crash) and many families are suffering now because of it, only to pass it on to the next, to fix.
(And Ian, that fella there, had a lot to answer for, but now he doesn't need to)