We love the Hilton. And we just stayed there for $85 via lastminutetravel.com.
It's a bit of a walk, so with a child we use ART. However, if you don't have kids, it's walkable. The easiest way is to go out of the Hilton like you're going to the convention center, cut through that area, cross the street at
Disneyland Dr. and then cut through the Grand California hotel to Downtown Disney.
If you do have kids, the Hilton added a waterplay area by the pool, that has a splash area, a small water slide and water dump bucket, so it looks similar to Hojo's water play area. They also were showing movies by the pool (Tangled when we were there) and had a kids art and craft thing from 12-6 by the pool. I'm not sure if the arts and movies were just for the summer and/or only by the weekend, but something to keep in mind.
The rooms are clean and we've never had a problem with anything.
If you are booking them with last minute travel, be sure to check your Hilton bill before you checked out. I had prepaid with LMT and Hilton tried to charge me for the room. I went down to the check in desk and she took off the charges but said it happens all the time because they need to do something in their system when checking you in and she said they always forget to check the box.