@twone2 A reverse image search with google brought up the building. Then it was just some work with google maps inspired by @MartineauSeb. After I estimated the exact spot I checked google maps again. This time more closely because of your hints. So I found the pictures you took.
@twone2 I think that could have been your position? It's kind of confusing because the entrance with the flags doesn't really fit. But I just assume they might have moved the flags to the other entrance.
@fiete_stegers@quiztime Ok here is how I found it: After figuring it was a "Pilsner Urquell" container I visited their facebook page. There I found this post. A google search then led me here -> https://t.co/R8IQJhPQXO The rest was google maps/street view.
@twone2 a bing search for the first two greek words of the right sign brought up the restaurant. it wasn't easy to find as the result was all capital letters where the sign wasn't.