Our stay in Gamla Stan was great - accessible location, easy access with the mobile key and the apartment was well equipped and had everything we needed for a comfortable stay. A couple things to mention though was that it being an old building the windows are very thin and so were woken up at 5am with the restaurant below emptying their bins - and same goes for access into the building with the old door slamming late at night/early in the morning. There was also a bad sulfur/sewage smell that was in the bedroom for the second day and night of the stay which was unfortunate. The location was really ideal though, so I'd just pack earplugs if you're a light sleeper and hope that the host could fix the smell issue. Thanks for the stay and hope to visit Stockholm again soon.