The bins are set out for the day to be emptied. No different than anywhere else.
The longest graffiti mile in the wold - and it is not the Danube River, but the Danube Canal, only a small side arm of the Danube, which, because of frequent flooding, was regulated for its entire length (at Schwedenplatz however, on the canal you have the dock of the Vienna to Bratislava Twin-City Liner excursion boat).
In my post from about a month ago, you can see the area, and one of the photos shows graffiti, with a link to my flickr album exploring Urban Art along the canal.
https://steemit.com/photography/@thermoplastic/a-nice-vienna-afternoon-get-together-with-artist-friend-sabina-nore