Google new grad onsite

Hey, I'm interviewing for a new grad swe position at Google. I'm currently scheduling my on-site interview and would love some advice. :) Can anyone share what their experience was like? What kinds of questions should I expect? How difficult was the interview? Also I have a choice of location: I can either interview in Mountain View or I can interview at the Pittsburgh office. Pittsburgh would be local so I wouldn't have to travel. Mountain View would mean traveling/skipping classes but I heard interviews might be a little easier there (plus it's a cool campus!). Any thoughts? Thank you so much!