Advice for self managing property 3 hours away

[Kevin Phu]

I have an SFR in Oxnard that I am househacking at the moment but I will be moving to San Diego which is about 3 hours away soon. The current tenants are remaining and I intend on keeping them there as they are good tenants (on time, govt employees, no issues). Does any have any advice for self managing a property like this?

The tenants are already set up on an online portal where they pay their rent and can submit maintenance requests. How would you go about managing keys, lock outs, etc without being in the same town to take care of things if needed? 

I contacted one PM already that was referred to me but they won't take on individual leases on rooms within one property. I have a few other companies to contact but I am doubtful their response will be different. 

Stressing out a bit...