It's a mixed bag, but overall a good pick. This is not a quiet cottage sitting alone on farm. It's part of a complex of closely-spaced holiday homes, so you may have some noise. You almost certainly won't get the cottage pictured-but you'll get a nearly identical one somewhere in the complex. Also, the washer/dryer is shared in an outbuilding, and the mattress in the downstairs bedroom was years past it's useful life and very uncomfortable.
BUT. It's clean and warm. And, more importantly, it's within walking distance of the Park (and a couple good places to eat). The Letterfrack area seems to be mostly hostels and budget accommodations, so this is certainly a few steps above that! Also, the horses and dogs were lovely!