Dear Baylor21,
BTW, I just wanted to tell you that I'm a big fan of yours
!
Johns Hopkins does have student hosts, which they tell you about in the interview letter. (although you have to look pretty hard to find it, I initially missed it, so when I finally contacted someone it was too late). I ended up staying in Reed Hall, their dormitory. It was a nice place (a little old, check out the elevator!) but very conveniently located. Best of luck, I hope you like JHU, I like it very much... perhaps too much, 'cause now I'll feel pretty sad if I don't get in :T .
About GW, I don't recall reading anything about student hosting. Interesting though, when I was there last tuesday, and they cancelled my interview due to the tragedy, at least 3 students (strangers) came up to me (I guess I stuck out like a sore thumb in my suit) and offered to let me sleep in their place for the night if I was travelling from out of town. Really nice of them I thought!
Best of luck, and I hope you do great in your interviews!
Chunk-ee