The best value hotel that I have found is the Camden Deluxe Hotel, its costing €80 per twin/double room whether single or double occupancy, this works out at about £53 sterling.
For those that know Dublin, this hotel is at the top of Camden Street, opposite "The Bleeding Horse" great pub, and the Luas (tram)
I personally know this hotel and its lovely, don't know why its not gotten its 3star rating, all rooms are en-suite
Hopefully my link here will bring you straight to the hotel...Surprisingly I used a different search engine for this hotel and they were looking to charge more, but I HAVE BOOKED and its costing me €80....
Hotels in Dublin - BOOKING.COM online hotel reservations=