It was heavy snow during my stay in Stockholm. Thank you Henrik for taking good care of us.
The location is just like ~5 mins talk from the subway, and ~8 mins from the ferry.
Since it's next to the main tourist alley in Gamla Stan, need to expect there will be some noise during night time but it won't be too loud or last too late.
Overall it's a very nice and valuable experience to stay in a hundred-year apartment.