My recommendation is
Anaheim RV Village. We stay there every year... Its in walking distance to Disneyland. While the spaces are tight. The campground has great amenities... Excellent pool and hot tub. Sites are all level, power, water good, sewer in the right location. Good Laundry facilities and an RV wash area if your not too tall. The staff are great to deal with. There is the added fringe benefit that one can watch the nightly fireworks at Disneyland right from your campsite. Grocery, pharmacy close by plus an excellent array of restaurants.
Once parked plan on being close to your neighbor if you have one:)
JohnnyT