This place is near perfect. Really nice separate little guesthouse from the main house, very comfortable bed, great little shower, nice touches (e.g., brown bread, butter, jam, tea bags, milk), very cosy even on a cold, rainy, windy day outside. Great location - 5 minute walk to the H3/6 bus stop which takes you into Howth Village/Dublin or up to Howth Summit. 15 minute walk into Howth Village/Howth Harbour. The one significant negative is that the wifi/internet was practically useless (super weak signal, hard to connect to, slow) - we ended up spending 35 Euro to enable hotspot internet service for one of our phones (not ideal, but better than nothing).
With so much going for it, I would probably stay here again. Hopefully the wifi issue can be resolved.