They specify their city, mostly. After that, apart from Dublin, there's no real problem IMO.
Some even give out the street, which is probably not good practice.
But thank you surrealname for this question.
LOL
SexyWestie Number 69 The Clit Fanny Avenue Missionary Road D4
Please note that i charge ,a lot apparently ,for my time and companionship and if you ask for a discount, i will let you standing by the bus shelter like a fool.