Graduating, going on exchange, or arriving mid-year? This thread is the place to start. Say your dates, your budget and the building or street, and reply to anyone who fits.
If you are subletting your place, check your lease first. Many leases need the landlord's written approval. Put the dates, the rent and who pays utilities in a written agreement.
If you are taking a sublet, see the place or a live video tour first, and do not send money before you have signed. If something feels rushed, slow down and ask here.