I was extremely fortunate and happy to get to stay at the GCH on my last trip but, quite frankly, it was disappointing. The rooms were extremely average so don't expect to find the room to be of higher quality than the DLH. The lobby, which everyone raves about, was noisy and crowded almost every time I passed through. The pool was underwhelming.
I say all this and I'm making it sound horrible, but it definitely was not. Just wasn't as ridiculously awesome as I was picturing. The location CAN'T be beat. The fact that I could leave my room 5 minutes before DCA closed and still get one last GRR ride in was awesome.
Next trip will be at the DLH though, and I'm very excited about that. Stayed there all throughout my childhood and have great memories. We'll see how it is now that I have kids but I expect I will actually prefer it to the GCH.