We had a good time at Heron Cottage. The view from the dining room is absolutely stunning. Just hope the clouds will dissipate at the end of the day (not a given, unfortunately) and you'll have amazing photography material right next to your door!
We found the boat trip on the killary fjord a bit dull and expensive for pretty much the same sights you can have from the road.
Make sure you have filled your car because gas stations in that region are not frequent. Also, the lack of wifi requires a bit of preparation for your activities before settling in.
Apart from that detail, great location!