Cillian is a great host - really attentative and easy to communicate with! Also helpful with advice on anything one night be intersted in doing or seeing while in Dublin.
The area where the appartment is located is good as well - within walking distance of the city centre, next to public transportation stops and a bicycle rental spot. Also some nice coffee and food places and a little shop next door.
The place was about what I expected it to be - an old house, so the windows are quite thin and you can sometimes hear the cars going by, which might trouble someone who is a light sleeper. But don't think it's a problem really, as the room might have the most comfortable bed I have ever slept in, so sleeping tightly was not an issue. :)