You could argue that if the OP is an Irish resident and will be working here then investing in Irish property is doubling down on the performance of the Irish economy. If the economy took a serious downturn he could lose his job as well as take a large hit on the property portfolio. I think it's important to diversify in terms of asset classes as well as geographically. There's no real right or wrong answer but OP seeing as you've already done the research on property I'd recommend reading at least a couple of beginner investment books so you have the full picture before making any decisions.
I have rental properties in Ireland and Germany, my own house in Germany and my shares are deliberately weighted away from these 2 countries.
I have no real clue about which company is the next big thing, so I invest passively in a MSCI ACWI ETF, a bundle of shares in app 2,400 companies spread across 23 industrialised nations and 23 emerging markets but 90% weighted towards the industrialised countries, which in turn are mostly weighted towards companies based in the United States but most/all large US companies derive profits globally so you are not overly exposed to the US economy itself.
It works for me like this as World ETFs barely factor the Irish economy in at all and even Germany is only 3% or something like that.