1) I do live on campus and love it. It's a 4 minute walk to class and the campus has pretty much everything I need on a normal day. I think applying for housing first opened for me in March and I applied the first day. Got my first choice, studio with a washer and dryer which is super nice.
2) Well I'm not the best person to ask for how tough the exam are (have all A's) but they aren't easy. I put a lot of time into preparing for exams because that's what I'm paying for, a great education. All of our exams are the same tests the D.O. take so you are getting a full medical schooll education which sets you up well for good residencies and for your future practice.
We normally have at least 1 exam a week with a couple exception weeks. Some weeks you have more. I know 2nd year you tend to have at least 2 a week. Also, this year when we have an anatomy exam (practical and written) we also have histology and embryology that day to but they tie the material together. It's hard to explain that without going through it but I like it.
3) regards to the quarter system, I don't think it really matters so far. It's kind of nice because after each quarter you get a week off (next weeks is finals week so I'll get to know what a week off will feel like lol) but we don't get summers off here which I think is nice because then you stay in the groove of studying. You are learning and taking exams no matter if it's semesters or quarters.
4) I think my favorite part has been the weather! Im from Wisconsin where it is humid all summer long so having dry heat is way better!! Also, there is anything you can possibly need within a 20 minute drive, literally anything... lol i dont have a car right now, trying to save money since im on campus and just uber it or ask for a ride when I need to go somewhere and I have no issues with that.
Hope that answered your questions!