Crystal Gade just above Raadets Gade - the synagogue is just on the left, the lower gate to Smith Fancy about where the photographer is standing, 7B Crystal Gade was my mailing address for many years, when it was delivered to 'Fat City' a saloon right at the corner of Crystal and Raadets Gades.
Back Street is parallel to Crystal Gade one block South towards the harbor.
Great old picture --- Thanks.