Also Solo 401k could be a better option for you if you're self employed with no FT W2 employees.   

You can always do it with your own IRAs, however your employer's 401(k) may or may not have such an option.

The property is rented out for $3,200 per month, while my mortgage is $2,100, and the HOA fee is $268.I explored the option of taking out a second mortgage.

Have you considered the idea of house hacking as an option?

When I start to post, I don't see "furnished" anywhere as an option for listings.

Other than Regus there are very few options. 

You can do a trial and see if bank feeds connect, if it does, I would then recommend using it over QBO.One of my client that just started in development is short on funds so Xero was the only best option and they are using a local bank so we couldn't connect and a lot of manual entries. 

There are a few other options as well that can be taken to escape the FHA to Conv. 12 month rule.

That would be best option as a traditional bank wouldn’t do this I read that I can assume the existing mortgage.

Also, when they said they have "network" to find investers/property owner to land my offers, and "system" to calculate profits in order to show whoever owns the property short term rental is the more profitable option.