I am currently a sophomore at PSU, I enjoy the Portland scene here personally, but can definitely not be for everyone. Student population is around 27,000, but PSU is considered more of a commuter school. Probably 60% of students live off campus. The city IMO is awesome a lot to do any day of the week also your about a hour and a half from the beach and Mt.Hood.
First year I lived in the dorms (definitely recommend it) where I met a ton of people and now everyone has their clicks, and everyone moved off campus and have their own houses and apartments around campus.
It can be hard getting to the mountain if you do not have a car. There is the Grease bus that takes you too meadows, but personally I do not like meadows as much as Timberline and Skibowl.
I do not know if you have been to Hood, or Portland at all, but I definitely suggest coming to a few tours to make sure you will want the inner city lifestyle
Message me if you have any more questions.