For those of you (and me) who managed to get the Ryanair tickets for next to nothing to Dublin, this hotel may be of interest.
I booked a Tuesday flight return Wednesday in July and managed to get a deluxe room (without breakfast) for only £10!!! Had a quick look and it seems to be for a month only from end of July to end of August midweek only.
Hotel states that it is 2 miles from the city centre and 5 miles from the airport.
Hope it is of use to someone.