It's a good idea for travelling in case of sightseeing and balance between your budget and entertainment, it's known that now because of that it's a nice place for foreigners vacation. And travelling to Ukraine is totally safe, except the Eastern regions.
There are many cities which are worth visiting, depends on what type of vacation you prefer. For example, if you're interested in mix of sightseeing and modern entertainment, Kyiv will be your best choice. It's truth for Lviv and Kharkiv
https://ukr-prokat.com/en/blog/zaporizhian-sich-the-excursion-from-kharkiv.html .
