Show them your job offer, a recent paycheck, a recent bank statement and your European credit report. People in the Bay Area are used to people moving in from overseas.
Up to the landlord's discretion. Recommendation letter from your previous landlord (if any), bank account statement, higher deposit (reimbursed after x months) are things to keep in your back pocket.
Landlords discretion, I allow no history with a cosigner.
Like who? I am not a new grad (TC 300). Who would have to co-sign my lease?
Most often it is for recent grads so their parents co sign a lease.
Whats 3x rent?
3 times rent < TC, I assume.
Rent lower than 3x base.