I stayed here at attend the Groove Festival in Kilruddery house. It's a 15-20 min walk from the venue, so very convenient. There's a bus stop outside the b&b. The bus can bring you to neighboring Bray or Greystones where you can take a Dart to the city.
Check in with Tony was a breeze. We were shown to a room that was much bigger than expected. Amenities are very basic, there was a small bar of soap to use for everything - no shampoo/shower gel. Towels, hairdryer, tea/coffee are provided though.
The beds are comfy and we slept well. There is no noise isolation in the b&b, so be prepared to be woken up by guests in other rooms talking. It really seems as though they are in the room with you.
Finally, breakfast was amazing. So much cooked food, good quality too. Really kept us going all day.