We're stayed at the Fairfield Inn and are going back in April for four nights. For us, we really liked it! As a late 20s childless couple, it was perfect. We had a very large, comfortable king bed and a very nice bathroom/vanity area. We really liked how much room we had to spread out. Also, we had the high floor premium view (I think that's what it's called) and booked it again this time. Nothing like throwing the door open and seeing the Matterhorn, Space Mountain, and California Screamin! We found it very clean and comfortable and every employee was very pleasant.
It was a 5 minute walk to the gates of
Disneyland Park, if that. The little sundries store had a ton of items (of course I forgot a few things...) and most of all, my boyfriend loved that Panera was right at the exit and on the way to the park. He ordered oatmeal from our room, it was ready by the time we walked there, and he finished it by the security gates! I have nothing but good things to say for it.
ETA: off-hand I believe we are paying ~$200 per night for April 2nd-6th, which includes the upgraded room view. I signed up for the free Marriott loyalty program and was able to get a cheaper rate that way. My friend works for Marriott and they advised me to do that and it was really beneficial!