How to link a field to node title in view
You get %20 because the browser replaces/fixes/auto-corrects the empty space between your title with %20 as empty spaces are not allowed in URLs.

EX: If you try to go to drupal.org/Hello World, browser url changes/corrects it to drupal.org/Hello%20World.



Here is another possible option:

Add Path as a field, and checkmark exclude from display. 

Make sure Content: Path is above Content: Cities, if not please re-arrange it.

Then in cities, for link path put [path]