I have to disagree with those who would say the DLH if at WDW, would be considered a moderate hotel. Having stayed many times at WDW in deluxe accommodations, it's not a fair comparison. Maybe with the old crappy rooms, but not now.
Two weeks ago I wrapped up my trip with 4 nights in a 1 br villa at the GC and a 1 night stay at the DLH in the Adventure tower.
Both hotels are very nice and you can see that they were made in a quality fashion. The DLH had a way more classic Disney theming to it and the rooms were great. You get the feeling of being at
Disneyland when you're in one of those rooms. The picture of Walt walking in DL, the Disney and Mickey touches everywhere, and even the carpet is Disney themed. I loved the room and it was a great way to cap off the vacation.
The GCH 1 br villa was nice and the GCH is very peaceful, the pools are nice and low key. It doesn't feel like your at DL though, IMO. It's the perfect place to stay if you want to get away from the chaos of the parks. The entrance to DCA was great and so was Story Tellers, who's breakfast buffet was better than Goofy's Kitchen and cheaper too, IMHO. It was a much more subdued atmosphere compared to GK. Steakhouse 55 was the best place I are at all trip, including breakfast. Top notch service and food. Never a wait or had a hard time getting reservations. The best steak I had in a long time and way better than the surf and turf combo I had at Blue Bayou.
I have stayed in a standard room at the GCH last summer for one night and found the room way too small. I found the rooms at DLH to be bigger, but I missed having a balcony to sip my coffee in the morning. Once the whole pool area at the DLH is done, it's going to be a very popular spot. Trader Sams is off the chart cool!
IMO, if you're only going to stay in a standard room, want more classic Disney touches, more room to spread out, and don't mind the little extra walk, go with the DLH. If you like the old craftsmen style architecture of vintage California, a quieter atmosphere, and a closer location to the parks, especially DCA, don't mind the smaller rooms, the go with the GCH.