Mortgages and tax relief on rental

Working and living in Europe. Buying investment property in Ireland. Planning to finance purchase via equitable mortgage from European bank ( on european owned property).
My Q is - Tax implications on rental from irish investment property can be set against what mortgage?
I.E. - would it better to take out mortgage from Irish bank insofar as mortgage repayments can be set off against an Irish bank mortgage only - OR - can irish rental income be set off against Europen Bank mortgage anyway?

Revenue don't appear to specify anywhere that the mortgage has to be raised in Ireland. So I think you would be ok raising a mortgage in your home country or whereever and as long as the mortgage is used to buy the Irish property or improve the Irish property then you will be able to offset the mortgage interest aganst your rental profit when calculating your Irish tax due