We grow apples, raspberries, black currents, small but sweet grapes, figs, gooseberries, cherries and tomatoes.
All of them thrive, apart from the cherries. The birds get to the raspberries first, but we mind because they probably need them more than we do.
We also have a sweet chestnut tree planted, but will have to wait a few more years for it to mature.
All of these plants, apart from the grapes, are low maintenance. The raspberries are practically wild 'weeds'.
I would suggest trying some things out and see what works. Apple and pear trees should work well in Ireland - try a different variety that you might not get in shops.
Please don't neglect 'useless' shrubs. If you plant some native ones, you might help the local insects and we need those.