The concept of the loan is great, I'm just concerned because I see lots of bad reviews about their customer service unfortunately. 

What’s more baffling is that, instead of rectifying the issue, Mike provided access to the wrong account – the unused and unknown one – and eventually led to the cancellation of both my accounts.This experience not only highlights serious issues in their customer service but also raises concerns about their internal account management systems.

Now, I understand that HELOC should be used for short term financing purpose and I am concerned that I may have made a misstep. 

For us there is no perfect property to manage.I am more concerned with the owner. 

What concerns me most is that statement: "I have yet to have a conversation with a seller"Here's the truth: It'll probably take talking to 50-100 prospective sellers before you even have a shot at getting a deal.You don't get to change that.You do get to decide how long you'll take to get those conversations completed.Reach just 1-2 sellers per week and it'll take you a year or two before you get a deal.Reach 10 sellers per weekday, and you'll likely get a deal within a month!

If it was just an email (again have not seen it) that says they are pausing with no explanation etc. that would be a very big cause for concern.3.

Is it just not my worry what their income is since the voucher covers the rent, or is my concern that if they only have about $950/month then they won’t properly be able to maintain their pets and their standard of living valid?

You pretty much validated my concerns with purchasing or rehabbing within certain Class standards. 

However, I am worried about the outdated electrical and water systems for safety concerns.

Despite this, substantial changes are imminent and will start rolling out this year.The initial change will be the mandatory registration of all short-term rentals, accompanied by a registration fee.