Looking for a place to stay in Birmingham (Erasmus)

Hello everyone, my name is Judith and I'm 18 years old (19 in September). I'm from Spain, Barcelona. I'm an university student (Pompeu Fabra University). I have to do an Erasmus next year (3 months) in Birmingham, Aston University. I need some help to find a place to stay.

I'm going to do a little description of myself and how I am so you can imagine how  could be living with me. I'm one girl shy, fun and resposable. I take care of my things and I'm clean. I like the order and I like helpping people when they need me. My friends use to say that I'm too good with everyone. But, like everyone, I'm not perfect. My humour is a little special but nothing to worry about. I'm short, brown eyes and brown hair.

In relation with my trip, I need one place to stay for 3 months. I'm coming in September  and leaving in Desember (middle). I don't mind if I have to share one flat or anything. All the places will be good. If it's possible, would be good if it's in the center or near Aston University. I'm really glad if you could help me. About the prices, I'm open to negotiate.

Thank you so much! I'm waiting for your answers.