I would be interested in finding an answer to this post too as we bought our house in september 2007 and it’s in too much of a state to rent it out! Don’t want to get into trouble if we are supposed to submit a form stating that we have no income on the property and confirming we live out of the country.
If you are non-resident you have to pay two taxes. One is a notional tax whch assumes that you receive rental. It has to be paid whether you rent or not. The other is a tax on the value of the property. Both are paid on form 214.
The 214 is available at your local tax office and (maybe) at an Estanco. Most people employ a Gestor to do it. You Lawyer will also do it (for an outrageous fee!).