But if 50% of the homes in the area are 2 bedrooms, then that's what people are used to.

If it cash flows at 3.5% down, why wouldn't an investor putting 20% just buy it?

Well, I'll repost here what I originally did in response to the email from Vrbo that some people got saying Vrbo was giving a promotional discount to prospective guests, and hosts could opt out if they wished. 

You want to fine tune what the answer to this is because too many people start thinking the road to financial and time freedom is a lot shorter than it is.Find some local real estate investor meetups and talk to other investors and learn about their path while you find yours.

Most people get a yearly raise.

This last March a used the 5% down program to buy a duplex in NH.

If someone developed a new property specifically for someone to buy who would be house hacking, what are some of the main things you would want to see in the property?

If you want to, you can see just how some people are customizing it for real estate by doing a search on Youtube for "Podio For Real Estate".

Make sure you document the timeline of events and get as much documentation from the people you evaluate the situation.

I would recommend buying the 4 plex too at your age.