Our ERASMUS decision was quite close to the application deadline, so we had a long mailing about what courses are still available, but KI's coordinator was really helpful. I would recommend you to wait for the confirmation letter, where you will have your rotations. If most of them is in Solna applying to live in Pax or Strix would I say, if most of them are in Södersjukhuset, jagargatan is just next to the hospital.
A member of Global Friends contacted me before arriving and I could ask every question I had. She also picked me up at the Central Station of Stockholm and escorted me to the dorm.