The beginning of summer on the Twin City Liner feels like the perfect way to slip into the season — leaving Bratislava with the soft morning light on the Danube, the city slowly falling behind as the catamaran picks up speed and the river widens into long, calm stretches of green. The breeze on deck carries a hint of warmth, cyclists wave from the embankments, and the riverbanks shift from castle silhouettes to quiet villages and open fields. By the time Vienna comes into view, the journey feels less like transport and more like a gentle transition between two capitals, a small ritual that marks the start of summer with movement, water, and the easy rhythm of the Danube.