Composers' Quarter Peterstraße

The residential complex on Peterstrasse is, apart from the former Beylingstift (39), a reconstruction of houses from the Katharinenviertel. It conveys a piece of old Hamburg and in one passage you can see the history and pictures of the old quarter.
It is also the seat of the composer's quarters. At the corner of Neanderstrasse is the Café and the Museum of the Old Masters (Telemann, C. Ph. E. Bach and Hasse). Here you can also buy the tickets, also for the Brahms Museum, Peterstrasse 39.

Swell:
komponistenquartier.de
de.wikipedia.org/wiki/Peterstraße
de.wikipedia.org/wiki/%28Hamburg%29

The composer quarter Hamburg is a museum ensemble in Hamburg. The participating museums are the Telemann Museum, the Carl Philipp Emanuel Bach Museum, the Johann Adolf Hasse Museum and the Brahms Museum. For March 2018, the opening of a Fanny and Felix Mendelssohn Museum and a Gustav Mahler Museum is planned.
The exhibition rooms are located in historically reconstructed town houses on the south side of Peterstraße in Hamburg. The exhibitions present the biographies of the composers associated with Hamburg and important for the European music history of the 18th century, want to convey the historical music life of Hamburg and make references to the city and contemporary history of the epoch. The exhibits include a model of a baroque opera stage, musical instruments such as the Tafelklavier, where Johannes Brahms taught, a Clavichord, the instrument preferred by Carl Philipp Emanuel Bach, and a spinet.
The sponsoring association of the same name was founded by the Carl Toepfer Foundation, the Hamburg University of Music and Performing Arts, the Hamburg Telemann Society, the Carl Philipp Emanuel Bach Society in Hamburg, the Hasse Society Bergedorf, the Fanny-and- Felix Mendelssohn Society, initiated the Johannes Brahms Society Hamburg and the Gustav Mahler Association Hamburg. Patron of the composer quarter is the conductor Kent Nagano.
On December 16, 2014, a symbolic key handover took place for the new showrooms, and on March 19, 2015, the Museumsquartier was officially opened.

Peterstrasse is also home to the composer's quarter. With the Brahmsmuseum, Peterstrasse 39, in the former Beylingstift and the café with the old masters (Telemann, C. Ph. E. Bach and Hasse). In 2018 Gustav Mahler and the siblings Fanny and Felix Bartholdy are to join.

Info and source:
komponistenquartier.de
de.wikipedia.org/wiki/Komponistenquartier_Hamburg