20 year old girl looking for a room in Mechelen or Brussels

I'm a 20 year old girl from Portugal who just finished university and is looking for a room in Mechelen or Brussels. I'm going to do my internship in Zemst for 3 months (from july 1st until september 30th) so i would like a place that would be close to that or easy to get to by transportations. I would be able to pay until 700-750€ so if you know something please hit me up because time is running out hahaha