You are making a common mistake in the area of property investment, you are starting the process from information given to you by a sales outfit in isolation from the local market realities.
For instance, who are the tenants for these kinds of properties? What are their names and how will they pay the rent? By direct debit maybe? Where do they work, and have they references? Do they exist at all? Of course they don't, you are the tenant, paying rent on your own property minus a hefty management fee. Maybe this one is different though, have you checked?
Go back and start at the beginning. Decide where you want to invest, then visit the location several times and get an understanding of the local market. Look at what is on offer there both in terms of product and income, then talk to agencies in the market (not just locally, some Irish companies have a good grasp of overseas markets and shouldn't be discounted -- in fact you can often do very well by involving a shrewd irish or other non-local agent).
If, having done all the above, you still consider the "guaranteed rental" scenario the best bet, go for it! Unlikely though if you look around. As a more or less general rule, this kind of scheme is not for investors, i.e. people who want to put funds into something for maximum return.