There are only 3 reviews on their website which are all extremely generic and I think aren't real.  

We do not verify identities, that would be a bigger lift than we are capable of currently, however it is against the rules to use a false identity per section 2.A of our website rules here https://www.biggerpockets.com/rulesSo anyone discovered using a false identity will be removed if they are reported to spam.

I checked the city's website and the plots fall into their "Low Density Neighborhood" district.

(Like I think Craigslist is still one of the best websites on the internet, but for some people it's a total turn-off because it still looks like 1995).Capterra.com is a great site for research in this category (and business software in general). 

Some of their websites will probably explain everything you need to know.  

Every unit has its own "microsite" of sorts with seperat msg threads and you can't write your own descriptions (which is understandable as they don't have seperate websites for different countries so they write "translation safe" descriptions for you), but still, it's no Airbnb.

This list was pulled directly from Raleigh’s website here:Raleigh Permits for ADUs and Guidelines Click Here to ViewTo find your specific lot’s zoning, use IMAPS: https://maps.raleighnc.gov/imaps/2.

You can create a website in seconds nowadays but I would also provide him a pitch deck to show how this works and that he is not going to have to evict you in 5 months because payments are not being made. 

Do you have a website? 

Through the HUD website How did you finance this deal?