I will be in SFo foe 3 nights 3 days on a budget. I was looking to spend not more than usd 100 per night for accomodation. All hotels seem not less than usd 300 per night and lower end hotels or hostels or inns seem to have safety issues. Tried even building scenario of staying near airport and travelling by bart! Have also explored option of bed and breakfast but to no avail!