Don't hesitate - Make the booking.
Be prepared - the cottage is not just remote, it's Donegal remote( a special " edge of the world" kind of remoteness).
Also you'll have to put more planning into food and fuel provisions than you're used to.
My family stayed four nights in late October, and despite very mixed weather, we all throughly enjoyed our stay.
Any extra effort you have to put into the trip or the practicalities of daily life will be more than compensated for by the experiences you'll enjoy there.
A big thank-you to the Woods family.