I currently use Gold Key Property Management in Anderson IN, and have been very happy with there services.

Materials: This section accounts for all the material costs.

I am under contract for a property out in Columbus and they are one of the few property management companies I am considering going with! 

Does anyone have any referrals for property managers in the Los Angeles area who specialize/ have experience in mid term rentals? 

A manager will roughly cost $100-$150 a month to take over a unit (it could be more or less in your market) and manage the units.

We are extremely unhappy with our property management company.

Samford's business school also offers a concentration in real estate investment and management.

Can you recommend a management software for managing 100+ doors I tried Cozy.

Any management fee structure (monthly fees) is simply a guess with regard to what will keep the PMC in the black in relation to the work that will be needed to manage the door. 

@Dwight HenningRecommend exploring as many sources as possible to get referrals AND cross-reference them to get as much accurate information as possible.Check out NARPM.com, BP’s Property Manager Finder (BiggerPockets: The Real Estate Investing Social Network), etc.Also, encourage you to learn from the mistakes of others - by reading posts here on BiggerPockets about owners not having their expectations met by their current Property Management Company.