Current 4th year RFUMS student here. Neither Waukegan or North Chicago are good places to live, esp. if you are single and a woman. That being said there are a few places close to the school that aren't terrible and they are relatively inexpensive. If you are planning to live there you have to check out the area or you will be burned. Crime can be a problem.
I live in Lake Forest (the land o' mansions and the Chicago Bears). It's night/day compared to Waukegan/North Chicago. Definitely more expensive, but well worth it. It's harder to find a spot as there are no apartment complexes and you may have to find a bunch of roomates to rent a house. I'm walking distance to the beach and all the local stores, only a 5 minute drive to the school, and a block away from Jay Cutler
. I stayed there all 4 years and don't regret a second. Lake Bluff is similar and also a great place to live.
If all else fails you can always live in student housing around the school. It wasn't my thing, but it gives you a better opportunity to get to know the rest of your class.