Need apt close to campus starting ~Sept 28

Single, neat, quiet graduate student looking for an affordable apartment (studio or 1B/1B, not shared) beginning late September.

My current lease runs out Sept 29th, so it must be no later than that.
I prefer somewhere on the Marguerite line, as I do not want to have to buy a car, but I'm willing to consider options nearby or in downtown P.A.