Food 4 Less is a no frills, bag-it-yourself grocery store chain, and I'm not sure if the term "nice" applies to any of them.

That being said, we often shop there due to the competitive prices. The one on Katella is by far the closest of the 3 to
Disneyland, being just west about a mile. The one on Beach and Lincoln is close to Knott's Berry Farm. The one on Orangethorpe and Lemon (hey, this is Orange County) is near the Disney Outlet store that's been mentioned in this Forum, not too far from downtown Fullerton.
If you want a "nice" grocery store, I'd suggest the Ralph's at Euclid and Chapman, southwest of DL. This is your more mainstream store, with people to bag the groceries for you, and mainstream prices. Ralph's, like Food 4 Less, is owned by Kroger.