I had some difficulty finding the building, as the [redacted] Maps app showed a different location about 5-10 mins walk away. Luckily Kunal was responsive and came outside to meet me after seeing my messages.
I had chosen the place because AirBnB's map on the listing made it look like they were very close to Dublin Heuston train station, and I was hoping to avoid dragging around my heavy luggage as much as possible, but I was a little disappointed to see that they were more like a 10-15 min walk away. There is not much else within walking distance besides Phoenix Park (which is huge and I hear it's beautiful), so I don't see much advantage in choosing this location unless you're especially interested in that.
I only stayed for one night, but I felt that he and his wife were very friendly and hospitable. The room is in their home, but after check-in they went about their own business and left me alone, so I enjoyed the privacy.