From Hotel Krone Unterstrass, you can easily reach Zurich Airport:
By tram: Directly in front of the hotel, you can take tram line 14 (direction: Seebach) to the “Milchbuck” stop. Then change to tram line 10 (direction: Airport, Cargo) and travel to Zurich Airport (total travel time approx. 30 minutes).
By taxi: A taxi takes about 15 to 20 minutes, depending on traffic.