From Tegelbacken and the Sheraton hotel, you cross Vasabron (the Vasa Bridge) to Gamla Stan (the Old Town). We are in the first house on your right when you reach the other side of the bridge. (the left wing of Riddarhuset - the House of Nobility)
From the subway station, Gamla Stan, go straight on to St. Nygatan and turn left until you reach Riddarhustorget. Walk around Riddarhuset (the House of Nobility) and into the yard. We are in the right wing coming from this direction.