Short answers, pulled from the story.
Mozart's birthplace is located at No. 9 Getreidegasse in Salzburg, Austria. The Mozart family rented the third-floor apartment from 1747 to 1773, and Wolfgang Amadeus Mozart was born there on the 27th of January 1756.
The museum displays Mozart's childhood violin, a harpsichord, portraits, family letters, documents, and early editions of his music on the third floor. The second floor holds the clavichord on which Mozart composed The Magic Flute, and the first floor recreates period living conditions with furniture from Mozart's day.
The building at No. 9 Getreidegasse has been a museum since 1880. It is owned by the Mozart Foundation.
The building dates to the 12th century and was originally part of land belonging to the Benedictine monks of St Peter's, Salzburg. A merchant named Otto Keutzel is recorded as owner in 1408, and the court apothecary Chunrad Fröschmoser purchased it in 1585. In 1703, the Hagenauer family took ownership, and Johann Laurenz Hagenauer became Leopold Mozart's landlord.
Seven children were born to Leopold Mozart and Anna Maria Pertl in the third-floor apartment at No. 9 Getreidegasse. Only two survived: Maria Anna and Wolfgang Amadeus Mozart.
The clavichord on display on the second floor of Mozart's birthplace is the instrument on which Mozart composed The Magic Flute. It is one of the most historically significant objects in the museum, connecting the Salzburg building directly to one of Mozart's final and most celebrated operas.