As far as logistics are concerned, we already have models for how many people can comfortably fit in say a theme park. Similar models exist for maximum population density in a city. If we were to use such models to estimate a maximum tourist capacity within a city, dependant on public space, transit and other infrastructure, we could find a very reasonable limit for tourist accomodations.
Either way, the decision to impelment such limits should be a democratic one, for the whole city. Private companies don’t often care for the quality of life of the locals.
Change in a city is just as important as preservation imo, as long as the change is driven by the locals not a foreign for-profit actor. After all, at some point there’s barely any of the original city left to visit.
Token German chiming in
You got most of it quite right, except the ending. It’s -erle, or really just -le (depending on where you split the word). The suffix is used to change a word to sound smaller, cute, playful and generally less serious. It also has a southern accent/sound to me, but take that with a pinch of salt. Not sure if there is an english comparison. Its similar to another german suffix: -chen