You will need Landlord's Liability Insurance - in case your tenant injures him/herself on your property and holds you liable.
You may also wish to avail of Loss of Rental Income Cover - this covers periods during which the property may be uninhabitable due to fire, water damage etc., costs approx. E50 per annum and can be offset against rental income for tax purposes.
I have two properties insured with FBD and have found their service good and rates competitive.