Geoff's flat is very close to the centre of Blackrock, right next to two shopping centres and a park and easy walking distance to the DART station into Dublin. It was very clean and comfortable with a lovely kitchen and a comfy living space and nice bedrooms. The train connection into Dublin was great (takes about 20 minutes) and there is also an Aircoach link to the airport, which we shunned in favour of the cheaper normal city bus (no. 41 from the centre of Dublin). There are several parkruns around to choose from if you are into running, and we had nice walks on the beach/ tidal area at Booterstown, which we walked to from Blackrock.
We had a great stay and would thoroughly recommend Geoff's flat.