This cottage was very conveniently located near the train station, making it easy to get around the city. We did not meet Grethe since she was out of town, but she was very helpful and responsive from afar.
As others have mentioned, the glass roof on this cottage makes it heat up like a greenhouse. We happened to be in Oslo on a couple of the hottest days of the year and it was VERY hot inside. Make plans to go out for the afternoon if you are there in the summer time. But once the cooler evening came it was easy to ventilate with a great fan provided and the door open.