The rewrite value actually comes before your post slug, so you need to visit localhost/wp/realizzazioni/{{POST_SLUG}} to view the post. If your new post’s name is “Test” you should be able to view the post at localhost/wp/realizzazioni/test.
Other tips: Make sure there isn’t a page already using the realizzazioni slug. Finally, flush your permalinks by going to Settings->Permalinks and just click Save Changes without making any changes.