I am coming to San Francisco this august and due to the hotels being sooo expensive i booked the Marriott in downtown Oakland. How safe is the area? I honesty plan on going from the hotel straight to the Bart station across the street with no intentions of exploring the area. being that i'm going with my brother we could be coming back late at night. Also how long does it take to get to San Francisco city center via the Bart from where im staying?