Looking for three nights accommodations in Locarno Switzerland .
Try posting on the Switzerland site.
It would help if you could provide more information on what type of accommodation you're looking for. There are lots of good hotels in the vicinity of Piazza Grande in various price ranges, There's also one HI Hostel which is clean and well run.
You will get more responses if you post in the Switzerland forum
https://community.ricksteves.com/travel-forum/switzerland
Forum search results
https://search.ricksteves.com/?button=&date_range=2y&filter=Travel+Forum&query=Locarno+hotel