I had someone ask me for a hint after I found an urban micro that she was unable to find. I was willing to help, because I know it is so frustrating! I just gave her some information that wouldn't completely give away the spot, but would at least point her and her husband in the right direction!
I think it's fine to ask--the worse they can do is say no, right? And perhaps if you feel uncomfortable asking the cache hider, you could ask someone who found it recently.
Good luck!