I just researched them and they have a really bad reputation...

If he knows you might threaten his reputation he might be more inclined to do the right thing.Get those quotes documenting that this was the builders fault to back you up.

What is their reputation and samples?

We were all in on RE, putting all of our extra money we saved toward the next down payment and the renovations.

It's essential to familiarize yourself with the local landlord-tenant laws and work with a reputable property management company to ensure smooth operations.Short-Term Rental Laws: Philadelphia has regulations on short-term rentals, but it is still possible to operate Airbnb and similar platforms within the legal framework.

The Inspection:I can't stress enough how important it is to hire a reputable and qualified inspector. 

In this industry, people know people very quickly and reputation is everything-- when working alongside others on their financial futures/supporting local economies, truth is the hallmark of success.

They were the result of the years of networking, building a reputation, having access to capital, and developing a great reputation/track record of honesty, fair play and success that brought me the deal flow those deals were part of.  

I have an excellent PM company and reputable turnkey operator in Memphis that I can refer you to. 

OTH, I think most of the seller financing issues are consumer driven, the banks never did have a slice of that market nor would or could they, and still can't.An HML type needs to be aware of such issues as they will be working closely with banks and will want a good reputation and working with the public, they had better keep fairness in mind as well.