I'm paying €500 a month at the moment for the use of a small room/office, kitchen, bedroom and bathroom—pretty much the use of the house. It's very cheap. It was a caretaker type arrangement; the original agreement was that the landlord would be away for most of the time but he's now moved back in on a semi-permanent basis.
I'm also saving €800 a month with An Post. So, I'd pay something around €1000 I suppose, though that seems like a great deal of money to give to a landlord.