We stayed at the Residence Inn last summer for 5 days. The rooms are nice and clean, the large in-room refrigerator a huge plus for freezing water bottles, the grounds are well cared for, and the area is fairly quiet and not conjested.
Now for the downside. Our stay was marred with less than acceptable shuttle service. The early mornings and late evenings were the worst, as they typically ran only one shuttle van (~12 passenger sized), despite having 3 of them.
Also, even though some will quote a relatively short walk of 15-20 minutes to
Disneyland's main entrance, it is a LONG 15-20 minutes, if that makes sense.
So, if their shuttle service has improved since last year, I would have no hesitation in recommending the Residence Inn. If you always plan on walking, then the shuttle service is not an issue for you.
BTMichael