Understand that this is an old building, and that the restroom and shower are down the hall shared with other residents of the building. If that is OK with you, this location is a great budget choice. It’s an easy walk to any of the sights in the downtown area, and just a 3-minute walk from the main bus station, which is useful for making day trips out of Dublin by public transport. The room itself I found to be fine, with a comfortable bed, and I liked the view of the river. There is a bus stop outside, so there was some noise, but I was able to fall asleep fine. Aidan was quick to communicate with me on any questions I might have.
If you’re looking for a cheap place to stay in the city center, and you’re OK with what I mentioned above, this is a good choice.