I was very happy with the place: the room was clean and had everything I needed. The position is perfect: the Airlink bus for and from the airport has a stop in front of the B&B, O'Connell Street is 2 minutes away, Trinity College at 15. The staff was very nice and helpful: I was able to get a hairdryer by leaving a small deposit and I left my luggage there for free for an entire day after I checked out.
It is true that the breakfast is not included, but there is a kettle and coffee and tea in the room.
I read many bad reviews and I feared I would have found a horrible place, but this was not the case at all. Yes, there is no lift, yes, the street is central so you can hear buses and cars passing by at night – nothing too loud, though – and yes, the bathroom is not spacious, but if you expect a five stars hotel when you pay for a two starts one, you are delusional. I would definitively recommend this place: cheap, central, clean.