I can only speak of Salzburg but at least there the issue that the city faces is the opposite, namely that a huge % of visitors are just in town for a couple of hours congesting the city while not consuming anything.
Is that because of Airbnb rentals, or just more tourists that are also chasing a more shallow experience? Snap a few photos and take the bus to the next stop. If I had to pick a tech product to blame, it would be Instagram, not Airbnb.
Thats just an untapped opportunity. How do they get there? It’s either bus, car, train, or plane. Raise fares or tax rentals so you can build to ease the burden from their traffic.