I just started using it and so far the owner info matches up with the county tax info. 

I recommend you go visit a few times to network with local investors or find an investor friendly agent so you can gain local market knowledge, find off market deals and for things such as showings, picture taking or getting accurate comps.

Seems to be decent on Airbnb with the guest house/ADU units with all the hospitals nearby.

I mainly want to ask if these assumptions are reasonable and if there's anything I haven't considered:(1) multifamily units in NJ close to New York City, ~$1,000,000, 20% down payment, (2) Using the following assumptions: 4% appreciation rate, 6.5% interest rate and 5.0% refinance after 5 years, $10,000 yearly maintenance fee(3) ~$6,000 monthly rental and assume 3% increase yearly with 5% vacancy rate(4) Based on the above, the calculated IRR if selling at the 10th year is ~19% (considering tax benefits) and ~17% (without tax benefits).

They will take it down if I post it.

What happens if you buy the SFH and hate renting it by the room but the cost to maintain is too much by yourself.

The cashflow should cove ALL of the expenses for the primary (mortgage, taxes, insurance, utilities, etc) AND put money in their pocket.

Keep the current investment and buy another house hack to live in.

Did you get started after this post and how is the success?

I have been looking at properties and it seemed like the seller s  based their price on zero percent cash flow for the buyer.