Michael's place in Drimnagh is great! We had a group of five, and it worked well for all of us. It is located a short walk away from a Luas Red Line stop, which you can use to get into the city center of Dublin. We also had a rental car, so the location a little ways out of the city center was convenient for us to drive to and from as well.
Michael was quick to answer any questions we had along the way, and he was able to give us an extra set of keys, which made it easier for our group to split up when we wanted.