My ultimate goal would be to buy fixer-uppers to turn into long-term rentals.

This vary heavily town to town. 20% down is great if buying strictly as investment but if you have a way of owner occupying I would explore that route and apply the 20% down to increasing value of property and instead using low money down loan. 

Hii I am a first time investor trying to understand if Austin is a good market to buy a SFH and rent.

Just one example of a market getting overheated and then right-sizing.Same is going on with syndications, STRs and soon LTRs.BP took off after the Great Recession when investors could buy almost anything and rent it out for positve cashflow.

I will be buying a multifamily property in a landlord-friendly state without any rent control.

MattIRA buys a property for 100k and puts 30k to 40k into the property.

I actually got caught up in the creative finance bubble of trying to lock up properties way over their value just because it had creative terms not realizing that if you were to buy a property at 120% of its value you will never be able to refi or sell without paying out of pocket.

What I find to be most valuable: Ease of use, cost-savings and efficiency and here's what I mean: If using an interior designer to furnish your rental, they will hand you a list of supplies + furniture to buy and what I was able to do with Minoan is upload that list as a CSV file and then they come back with a quote of all of the items they can fulfill along with their respective discount. 

Investment Info:Single-family residence buy & hold investment.

It seems like there are so many limitations to buying real estate with self-directed IRAs.