Is there a standard multiplier like say 20% of rent goes to vacancy and opex? 

I recently bought a rental and the insurance broker asked if I would be renting to students.

They should be able to guide you through the benefits of each scenario... just tell them you're thinking about living in the quad or potentially just renting out all four units.

I should share the capital stack, not pretty but gets the job done. rent price per square foot is super low.

More details on the dates and locations here: https://hospitable.com/host-and-toast/

My research has turned up a rural area with a decent rental market where 68% own and 32% rent.  

- How do you currently handle tasks like maintenance requests, rent collection, and tenant communications?

You also get to use the other doors rents per month as income (75% of each door) towards your income to qualify.A lot of the secrets comes from the ability to do the math on the deals prior to putting in an offer.

This is 100% top advice to think about - each state (and sometimes, often municipality/city) will have different processes, rules and yields for this - it is a very location-specific strategy and have to hyper-focus on a local market (more even for the rules/process than the real estate knowledge) to have success

Two of them I tried to place them on Section 8, but they get rented before that happened.