It attracted clients from the upper classes and was regarded as the most prominent educational institution for females in Stockholm in the 1830s.
Sophia Posse was a student of Cecilia Fryxell, had been active as a teacher at the school of Fryxell and educated on a government scholarship in Germany, where she studied the educational methods in Christiansfeld and the work of Amalia Sieweking in Hamburg.
Her school offered elementary subjects with focus on Christianity and language, and her methods were listening and practical use.
Still foremost a finishing school, it kept its good reputation in the subject of language, and continued to employ a majority of university educated (male) teachers.
During the late 1850s, it offered three two years-classes with the subjects of religion, Swedish, German, French, English, geography, Swedish history, history, natural science, arithmetic, drawing, singing and gymnastics, many of them with highly respected teachers.
Among its famous students were the philanthropist Agda Montelius, the writer Gurli Linder and the artist Anna Billing.