One of some pictures I took walking downhill from Galata Tower towards Bankalar Caddesi, so not all are in that street. This one is in a side-street of the Galata Kulesi Sokak (The Galata Tower Street), namely the Banker Street.

On the web I found: "Aşkenazi Synagogue
The only remaining active synagogue of Askenaz Jews in Istanbul. It was built by Austrian originated Askenaz. It exhibits a different view than the more traditional Sefare and Romaniot synagogues with its European style façade, Polish influenced Ehal (a cupboard in which copy of the Old Testament hand written on parchments are saved) and Teva (pray pulpit).
Banker Sokak 10, Karaköy"