I left Attersee and headed to Vienna.
After I had checked into my hotel (Hilton Vienna Danube), I immediately took a train to Melk for a river cruise along the Wachau Valley to Krems. I did not have time to include the famous Benedictine Abbey of Melk into my tour itinerary.
After the cruise ended at Krems, I walked for about 1 hour looking for the train station to get back to Vienna. I had wrongly assumed that the train station must be located near the ship jetty.