The website advertises: they offer conventional 30 year mortgage loans nationwide.

I think the main thing would be access to the books to make sure of the expenses.

And any time a journalist or anyone else claims to know, the first question I have for them is: "If you say that you have access to this accurate crystal ball, then why aren't YOU a billionaire?!"

Santarelli as an absolute industry expert (podcast, websites, press, social media advertisement) cause investors to have a false sense of security.

They said that they have access to external direct booking website and they charge higher commission rates if guests book direct vs VRBO platform. 

This access allows them to match investors with the most appropriate lenders, often resulting in favorable loan terms that align with the investor’s financial capabilities and project timelines.Moreover, a skilled private money broker excels in navigating the complexities of securing financing.

When you are new as an investor, you also don't want to work with a new agent (you).Overall, I think a RE license is good for access (to homes to get reps and to the MLS) and I think the course itself is way more valuable for investors than agents (most just stay in residential and don't need to use all the weird stuff you learn).

Additional things to consider: where is the breaker box and do both units have access to it if needed?

If your fee is $150k I would expect a very healthy budget to be spent to marketing and advertising this property all over the place.  

I haven't advertised a rental on Craigslist since 2010 and it was full of scammers and other problems back then.It's hard to believe that site ever survived.