24-25 Years old couple, Looking for accommodation in Rotterdam, close to University

Hi, we are two italian students (a girl and a boy) who are moving to Rotterdam for studying at Erasmus School of Economics. We would like to start living there since August 2016. 

It's preferable an apartment with only one Bedroom, but if we like the apartment we can  live with other people (in one big bedroom anyway). We don't smoke, but there aren't problems if someone does. No pets. 

Maximum price for a room or an apartment is 700 € .

It is preferable if the apartment is close to the Erasmus University (10-15 mins walking distance).