Looking for short-term accommodation in Belfast

Hi! I'm a graduate student from Canada who will be in Belfast as a visiting researcher at QUB. I'm looking for short-term accommodation between mid-May to early July. It will likely be around May 15 to July 3, but dates can be flexible. I am mostly interested in places in the City Centre or very close to the Centre. I am quiet, responsible, and respectful. Looking for something quiet and budget friendly. Ideally, I would prefer to just share with one or two other people, or a small family. Thank you! Feel free to contact me if you have any questions for me.