I applied for accomodation through the University Accommodation Center (UAC) and I got a room at Jägargatan 20 for the full stay (August - December)
The rooms are small, but contain basic furniture (bed, table, zink and closet) and I had a great view.
The kitchen and bathrooms are shared.
Jägargatan 20 is situated close to the city centre (Söderstation is just one stop from Stockholm central station, and you can go by Pendeltåg to Flemingsberg, if you, as I did, are going to study at Karolinska Huddinge)
Södermalm is a great area for shopping, dining, drinks aso.