For domestic tourism in Ukraine, it is worth checking out the website hotels24. Unlike Bookingcom or Airbnb, where hotel options are not always available, especially in smaller cities, here you can find a wide selection of accommodation throughout the country.

This is convenient if you are planning to travel not only to major tourist centers, but also to lesser-known but interesting locations.
For example https://hotels24.ua/uk/Shostka..../Recreation-centre-S