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Oh, I looked your post and also went further to the link in your post 👌
Seems so green, around the river in the whole Donau-Auen park!

Some years ago I stayed in Vienna with a good friend of mine. She took me to a place, crossing the Danube to the other side of the city, but I don't remember now the name of that part. There were swans and people fishing, swimming.

Maybe it was the "Wasserpark" (water park).
https://duckduckgo.com/?q=wasserpark+wien&iax=images&ia=images

Ow, maybe indeed. Yes, definitely somewhere there as I recognize that tall building from the photos :) 👍