We were at Moyne cottage for one night during the winter, a granny style house that might need some renovation. The house is very big, and it was a little difficult to warm it up. There are three heaters (one in the living room, one in the kitchen, and one in the play room, but none in the bedrooms). However, we were able to use the fireplace, and were comfortable in the living room during the evening, and two beds (a double and a single) have bed warmers, which made us sleep all right.
Besides this difficulties, the view from the house is really amazing. You might want to consider a stay in a warm season. However, a one-night stop in the winter to see the whales at Logans beach (with a little luck) is also fine.