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There鈥檚 an app for that called Music Traveler. It鈥檚 a startup cofounded by the violinist Aleksey Igudesman.
Otherwise you can sometimes find churches or schools that might let you practice.
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i have rented multiple airbnbs with pianos in them which is always my first choice. If you look at airbnb.com rather than using the mobile app, you will find a grand piano search option. I have done that for Athens, Budapest, Rome and Prague. If that isn't possible, I have found that most major cities have practice rooms somewhere near the city center. In London, for example, I practiced in practice rooms at Steinway Hall, Jack Samuels Piano Store, and at a private facility with multiple rooms, all walkable from our Marelybone airbnb. I found a practice facility in Manhattan too. Many times people have suggested contacting a local university, but I have had no luck with those. There is an app for private pianos to rent around the world but i have had no luck with that. Also, people frequently say check with hotel, but the only place that worked out for me was in Berlin, and in LA. Good luck