When I had a duplex I just put up a second box with a "B" on it by the entry to the second unit.

Go to Etsy and search for "rental property tracker," and you will find hundreds of nice spreadsheets to track 10-20 rentals, usually for under $10.Software has extremely helpful features like online payments, marketing syndication (click a button, and your property is advertised on multiple sites), electronic document review/signing, maintenance tracking, and owner reports.

If you are seeking an actual private lender or direct HML  consider starting your search here: https://aaplonline.comThank you so much.

Something else to consider is that once these properties are paid off, you could cross collateralize to purchase additional properties that fit your buy box so that you may not need to bring cash to the table for a down payment.

welcome @Cam Caraher and congrats on joining BP, this place is the start for many, sure was for me longer ago than I care to admit.I'm not personally in your market, although was born in dorchester and grew up in NH, but this is a great place to meet locals.If you have not already a great starting point is the Meetups posted here, just search for your area and see if any meetups are happening. 

Apparently the seller's title search didn't reveal a lien (ours did) which wiped out more than 80% of their remaining equity. - Expect rehab costs to exceed initial estimates (maybe double)!

I search them on LinkedIn, Facebook, and all social media.

I’d search out an established local operator and pay them to operate it.

Why Reviews Are Crucial for Your Airbnb SuccessBuild Trust with Guests: Positive reviews show potential guests that your property is reliable and welcoming, making it more likely they’ll choose your space over others.Boost Visibility on Airbnb: Higher ratings mean your property is more likely to appear in search results, leading to more bookings and greater income potential.Learn and Improve: Reviews often provide actionable feedback.

Had a quick inspection done, was told the property had about 5% knob and tube wiring along with other updated wiring and new breaker box.