Get an accomodation in Vigo, Spain
Finding a house in spain in not very complicated and not that expensive. As for Vigo, you can look on the websites : Mil Anuncios and idealista. Most of international students/ intern get a shared flat in Vigo. You can also contact ESN Vigo, they will help you get an accommodation. Some volunteers keep the contacts of many landlords that rent flat for a semester for international students.
About prices, you can count between 200 and 350€ top per month.
Most students live in the city center or around (the area between the city center and plaza america). I wouldn't advise to live close to the university.
If you live in Vigo, there is buses that goes to the university campus (CUVI : Campus de la Universidad de VIgo) in around 30 minutes. The main bus stops are : Plaza España and Plaza America.