Hello
Congrats on SCI ARCH!
I am an architect as well as someone who grew up in LA. It is a fun great city.
For Sci-Arc I would look in Little Tokyo, Silverlake and Echo Park also...Little Tokyo you could walk to school if you wanted. Silverlake and Echo are about a 15 min drive. I would stay away from the "toy" district..Craigslist is a good place to start also. Does Sci-Arch have a board of something for housing.
Good Luck and if you have questions about a particular address..Let me know
! As far as gangs go...not as much an issue in downtown as other areas and racism...yeeeesh I am not even going to respond to that

Having travelled all over the country this city is incredibly divers and multi-cultural. You just have appreciate all the differences...By the way great ethnic food areas DTLA!