You could live in Australia fairly easily for that, not Sydney however which is about the same price as Dublin!!! (More public facilities, better outdoor life and climate however).
Up North, i.e in Cairns where they are in the sub-tropical climate band (i.e very hot, tropical rains etc) the cost of living is half that of Sydney... same with Perth on the west coast, approx 2,500 km from Sydney.
Brisbane is your best bet, 1,000km North of Sydney, significantly cheaper, 300+ days of sunshine a year.
Of course you could try Sydney but 700 Euros a month is only barely enough to live anywhere!
edited to add...
It depends on what you need the money for... if everything, like rent, food and clothes then you will struggle, or just barely make it... if it is just food and clothes it would be easier.