We were quite unlucky with the weather, since even the forecast couldn't predict -1 and 0 degrees outside. That resulted in room temperature max of 18 degrees. And that also varied since the heaters weren't working all the time and the average temp inside was even lower. We also had to turn the heaters off at night because the water in them was so loud it was hard to sleep. The wood-heated oven thing definitely helped but the house is old and doesn't keep warmth for long. We didn't have the energy to keep it constantly going either.
So after day-long hikes in relevant cold it wasn't very pleasant to come back to a freezing apartment or wake up in one.
I ended up with breathing difficulties (I have lung problem) and we had to cut our stay there short and drive to the south.
Other than that, I do say that the apartment itself is cosy and cute and Gil is very hospitable! Just pick a warmer weather :)