I just got engaged to my fiancé, who graduated college in May and has a considerable amount of debt.

No college , no 5 years of experience needed .

This has helped with avoiding College Parties as they don't even search for 3 nights so that has helped greatly. 

I'd love to connect with anyone who has experience in acquiring small multi-family properties (2-4 units), particularly in college towns.

For example, I have a potential client that has decent unit with a solid location but the decor/furnishings remind of a frat boy out of college meets IKEA/Amazon.A unit like this will suffer from poor design and the reviews will show as well which I do not want affecting my reputation or Super Host status.Do I just decline taking them on if they are not willing to work on it?

The central valley has potential (I went to college at CSU, Stanislaus).

This is because the properties are cheap enough that landlords cash flow immediately, and they also get to enjoy the perks of having the college students around.

I’m considering buying a duplex and renting out one half while my girlfriend and I attend college.

That's a more difficult sell.You're likely going to have to rent it out as individual rooms, perhaps to local college students. 

I am currently a 21 year old college student looking to house hack in order to save money on living expenses.