As previously noted on this website, there is the city subway in Sapporo. The city subway has 3 lines. While all lines make connections at Odori Station, each line has its unique character.
Tozai Line is convenient for the access from New Chitose Airport. If you come to Sapporo from the airport, you can make a connection at Shin-Sapporo station from JR line to Tozai Line. It is also easy to go to Sapporo Factory which is near from Bus Center Mae station on Tozai Line. Some Japanese language schools are also on Tozai Line.
Thus, it is comfortable for international students who want to enjoy shopping and good access to the airport to live near stations of Tozai Line.