Mention all of the pros of the property (mechanicals, rent amounts, location, etc). 

Cash flow is a mechanism of leverage(min 1.25 DSCR).If you want to get even craftier, then of the cities you've set your sight on criteria wise try to go in as inventory increases.

It now makes me question whether other platforms, like Avail, are also allowing the tenant to pay via credit card and we as landlords are just unaware of the mechanism because it's a side of the transaction we don't have visibility into.

What systems are in place to ensure all sub contracts are being paid and no mechanics liens are being filed?

This far the mechanics of what he is doing are clear to me.

Check for cap ex coming, mechanicals, and smart repairs to do now that will save you later.

As an investment property owner, this means less maintenance and fewer unexpected expenses from storm related damage, often resulting in more affordable insurance premiums, less wear & tear on mechanical equipment, roofing materials or exterior surfaces.

If no, are there photos of each unit and all closets, the basement, the roof, the exterior, and all mechanicals?

If the building is currently recognized as a single family residence,  then you are changing use and presumably will need to sprinkler the building and satisfy other fire rating and STC rating requirements not to mention the added costs of having to run mechanicals for multiple units, multiple kitchens, additional bathrooms etc.  

Don I think what most investors miss with these funds is the lack of liquidity as in none until the investment cycles or the sponsor wants  to pay out.. the idea that folks can have a need for money after the investment and the Sponsor should pay it out upon demand only works if there is a mechanism in the offering to allow that.