There is no HOA because there is only one owner.Corey, clearing up these misconceptions will definitely help you more accurately calculate the cashflow on a property.$300K is a lot of money, no question.

Does anyone have a resource or way that they get a good idea of how much house they can afford with their income and credit that is somewhat accurate without having to do a full inquiry?

Get with your CPA who can help you get the accurate answer. 

Given that you're already to the point of having an offer accepted you're going to want to develop a very clear picture of the actual expenses measured against the income to be more accurate in terms of what you could actually expect for cash flow.I think it comes down to what the house is currently worth versus comps regardless of what it was listed for since the offer was accepted only $4,000 below their asking price at that time. 

This could make it easier for your buyer to know what responsibilities they'd be taking on with it.Lastly, I'd talk with an experienced broker/agent who could give you an accurate BPO or CMA on the townhome. 

Note, not all GIS measurements are accurate. 

But when doing research and calculations, use rentometer for the most accurate rental figures.HOA tips: make sure you actually read the HOA docs and the meeting minutes. 

Use a good real estate attorney, join a local/state real estate organization that provides lease templates (have it reviewed), hire a commercial broker who has this information.You need your lease to be accurate, legal and great. 

@Stephen LynchIf your numbers are accurate you’re currently at 75% LTV on your home you wish to refinance.

@Nicole HeasleyYour numbers look accurate on the operating expenses side.