We were just here for 4 nights (room# 303) and sharing a vacation with another family and used some points for our stay here (our friends stayed at the Grand Californian). We are familiar with the Courtyard (my husband often stays for business), so had a certain expectation of cleanliness. We were not disappointed. The room was nicely appointed (and bigger than a regular room at the Grand Californian), with a good-sized bathroom. Large-size tiles up to the ceiling in the shower/tub combo, and a decent sized granite counter with sink. There was a small bar outside the bathroom with the coffee maker on it, which had the refrigerator below. That came in handy for keeping the milk for our toddler, as well as some extra treats. We got a 2 queen room and I was happy that they didn't have one bed squeezed against the wall, as so often happens in hotel rooms with 2 beds. The beds were comfortable (not too soft, not too firm), but one side of our bed seemed to be firmer than the other for some reason, and was not as cozy. The air conditioning worked well, but was a little noisy. I worried it would wake up our son in the middle of the night, but we had no problems. We were on the third floor with a nice view of the pool and our room was pretty much at the end of the hall, so we didn't have a lot of traffic by our room. The pool was a good size and hardly ever busy, and one of us enjoyed some time in the jacuzzi. We parked in the back and entered through the back door with our key card, which was super easy after a long day at the parks. There was plenty of parking when we were there, but not a lot, so you may want to keep that in mind if visiting during the summer.
There is a restaurant in the hotel which serves a la carte breakfast items, a breakfast buffet, and dinner items (don't think there is lunch service). The buffet was $12.95, which I found ok, and they will allow you to fill a take out container for that price and take it to your room (which we did the last morning). The food was pretty good, with hot items and fresh fruit (biscuits/gravy, bacon, sausage, scrambled eggs, potatoes, watermelon, honeydew, belgian waffles). Also, there is a Starbucks in the Marriott, which is across the parking lot from the side of the hotel (2-3 minutes walk). It can be busy over there (especially if there is a convention), but if you have to have it it's there.
As others have mentioned, we experienced the presence of a big group of teens (there for some event). They were a bit loud, but we were not in the hotel much. We drove to the parks each day, so I can't speak to the length of the walk. However, we previously stayed at the Candy Cane Inn and did walk to the park from there (on the same block as Disneyland, on Harbor), and I can say that I would not want to walk from the Courtyard. I am in moderate shape and occasionally carry my 30lb. toddler on my back in a carrier.
Overall, we had quite a pleasant stay. We had originally planned to stay 3 nights and needed one more. It was a very easy transaction to add the night, even though it was a Spring Break week in SoCal and the hotel was busy (not sold out though). I would definitely recommend this Courtyard if you are looking for a clean, decent-sized room to spread out in for a DL visit, and don't require any special Disney ambiance in your hotel room. If money was not an issue I'd stay at the Grand Californian for the convenience, but the Courtyard was actually a bigger room, almost as nice (really) and allowed us to stretch out more I think, as well as being a deal since we used our points for most of our stay.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.