Can you please make a recommendation for carpet installers in the Austin area or should I just go with the big chain stores?

@Luis Cardona get the books on Flipping Houses and Estimating repair costs from Bigger Pockets https://www.biggerpockets.com/store these will help you understand what your customer needs.

Habitat for Humanity Re-Store ... it is hit and miss, but if you can find something that suits your needs there, you will not beat the price.

Today... a tenant comes walking in with a freezer full of food and wanted to store it in our freezer, saying the leasing agent told her she could. 

This helps ensure the security of the applicant’s private information and relieves the landlord of the responsibility of storing this sensitive information.

The Bigger Pockets book store if full of great books: https://www.biggerpockets.com/store

And don't remove or put her stuff out, or lock her out.. she has rights and this will cause you issues if you don't go thru the correct process.. she either agrees to leave on her own.. or court action.If she leaves and leaves stuff your still required to store it according to your state laws for that period of time.. 

If you don't mind me asking what type of strategy or systems do you have in stored for the property.

The Bigger Pockets book store if full of great books: https://www.biggerpockets.com/store

Any doorknob recommendations at either a big box store or online to buy doorknobs in bulk for flips?