If you are looking for the ideal apartment in Stockholm to base yourself in for a few days while you explore this wonderful city, the ideal location is definitely Gamlastan, the Old City, and in the Old City, William's apartment is in the absolutely ideal location.
The apartment itself is in a 400-year old building with 2-foot thick walls, facing on to cobblestone streets and other ancient buildings across the way -- it felt like we were in a time warp. Despite the age of the building, the apartment itself is sparkling clean, modern, wonderful kitchen and bathroom, but with the old touches including original fireplace, crown moldings, massive windows up to the ceilings.
William is the ideal host, providing 30 minute response time to almost all E-mails and a seamless no-contact check-in and check-out process. All-in-all a wonderful apartment in a wonderful location in a wonderful city.