Our host was absolutely lovely, quick to reply and very friendly. The apartment is well-furnished and tastefully decorated, with a lot of books about Ireland, which were a nice touch. It has a little kitchenette, and the host provided us with some breakfast basics for our first morning. It is a converted basement, but it still gets a reasonable amount of direct sunlight through the windows.
The bathroom is small but functional, although the shower booth has a weird narrow opening that's quite awkward to squeeze through.
The location is nice and quiet, but with very good public transport links to the centre: the tram and several buses stop nearby.
The place was really well cleaned EXCEPT for the hoards of spiders: I counted 8 in 1 room alone, including 3 in the closed, which wasn't great.
The other thing worth mentioning is that the house is an old one, so you hear every step people take and every chair pulled back from the apartment above.
Also, if you're a taller person (above 180cm or so), you'll have a hard time with the low ceilings, and you probably won't be able to stand up in the shower.
All in all, a good value for money given Dublin prices.