You could also contact the Students Union - they will have surveys of expected living costs. For private rented accomodation in Dublin you can have a look at www.daft.ie or the Evening Herald - depending on the area you should expect between 350 and 500 per month plus bills for a room or to share a room in a house share. It's possible to get bedsits or very small studio/1-bed flats for around 500 a month - these tend to be around Rathmines/Rathgar (the traditional flatland areas) and not always in great condition.