The architecture and the German text "Sonnenstudio" strongly indicate a location in Germany. The building style is characteristic of urban areas in northern or western Germany. The presence of construction barriers and specific street signage points to a dense residential neighborhood. I suspect this is in a city like Hamburg or Berlin. I am moderately sure of this assessment.

then: forward

The architecture, specifically the "Altbau" style buildings, is highly characteristic of German cities. The sticker on the utility box says "1. MAI," a common date for political demonstrations in Germany, and the overall urban layout confirms a German setting. The street scene with construction barriers is typical for residential areas in Hamburg. I am fairly confident this is located in the Eimsbüttel or Altona district of Hamburg.

then: guess