Astrid Lindgren, Swedish writer known for her fantastic children books lived more than 60 years  in Stockholm. When in  the district called Vasastan, get to Dalagatan 46 and find this inscription at the door. Though you cannot visit the flat, yet, by using the link below you take a virtual tour through her home.

http://www.astridlindgren.se/sites/default/files/dalagatan/AL_Dalagatan_sv.html