I am surprised that anyone would give $40,000 to a stranger to rent their apartment. What's keeping them from not giving it back to you? When your visa is up, and you have no choice but to leave the country, they could delay the return of your key money, or they could claim that the apartment was in better shape when you moved in. Maybe I'm just not very trusting, but these large key money deposits seem to put one in a position to where they could too easily get ripped off.
I've seen a few ads online that stated "low key money" ($2000 usually), or "no key money", but these ads don't seem common. I'm thinking of winging it by staying in a hostel in the beginning, and checking for apartments with low key money while I'm there. How possible is it to find apartment ads in english while there?