My girlfriend and I had a great experience at John's. The apartment and the room are clean, spacious and comfortable as announced. Regarding the location, we have not taken any bus during our stay, except in the last day to get to the airport. I walked to and from city center all days, without any problem, it took me probably 20 minutes to arrive at Trinity College.
John offered us a breakfast with cereal, fruits, bread and coffee or tea. We talked and shared some traveling experiences: John and his family have already taken the road from Dublin to eastern Europe - this tells you a lot about the people with whom you are staying. They were fantastic, I wish I could have stayed longer with them.