I am an accountant specialising in tax with a good deal of property experiance and am in the 'property game' myself.
As regards quotes for Income Tax returns, they would of course vary depending on the complexity of the individual's own affairs e.g. the tax return of an individual who had say PAYE income and one rental propety would of course require less work than the tax return of an individual with a large property portfolio and would therefore be less expensive.
A typical accountancy fee for an individual's tax return could be anything from €500 upwards. As a general rule of thumb, larger, more prestegious accountancy firms will generally charge higher fees.
If you have any further questions or need any help preparing the return let me know.
You should note that any fee paid to an accountant is a deductible expense for the purposes of calculating the total taxable rental income.