The architecture features neoclassical elements, such as the arched doorway with a decorative keystone and the symmetrical, multi-paned window. The masonry and the style of the iron gate are highly characteristic of central European cities, particularly Vienna. The small blue plaque near the ground is a common sight in Austrian urban settings. I am fairly confident this is in Vienna, Austria.

then: forward

The sign on the ground clearly says "Zufahrt gestattet," which is German. The architecture remains consistent with the historic, well-preserved buildings found in the inner districts of Vienna. The style of the windows and the masonry are typical of the Hofburg area or similar imperial-era surroundings. I am very confident this is in Vienna, Austria.

then: guess