Hi Beth! I stayed there years ago, and have friends (Ellen, who is coming with me on the Ladies' trip) who used to call it their regular Disneyland place to sleep until I turned them onto the HoJo.
It's nothing special, definitely one of those older motels. I have read that they have recently rennovated. The rooms are spacious and clean, but definitely no-frills.
Have you looked at the Anaheim Plaza? I'd say it's a slight step up from the Islander, they have large family suites, within walking distance, and pretty darn cheap.