Well here in Fukuoka, my foreign apartment cost me 60000yen a month, including utilities and everything. It's only 60000yen because I didn't have to pay key money and stuff, if you're only staying for a year, look into companies like LeoPalace21 or something similar company that deals with renting apartments to Foreigners. My friends apartment cost her 45 000 yen/month, but she had to pay key money and so forth, which sometimes adds upto about 6 months worth of rent.