There's lots of definitions and distinctions between the two that get thrown around. 

This is largely because I can typically get higher rents in B and A-class neighborhoods without relying on Section 8.I’d recommend focusing your search on C and C+ neighborhoods, for both multi-family and single-family homes with more than three bedrooms.

On our higher end houses we put stackable in our primary walk in closet I did this in the home I built and live in although mine are stacked they are full size not a combo unit. 

I made it clear that the minimum credit score and income requirement needed to be higher.

It depends on what the terms of your mortgage are.Pros-with no mortgage, you have higher cash flow.Cons-if you plan on buying more properties, you are better off saving the money for a down payment for your next place.The big questions are: can you get higher than 7% return if you invest that money elsewhere? 

From November 1 to January 31, we usually see higher Days on Market for most properties.It’s also encouraging that you’ve had some interest, even from those who may not fully qualify.

Another option if you're looking for something with higher yield than index funds, that's hands off, and will teach you a lot about real estate investing without having to do it yourself could be investing in syndications which is referred to in the book Jonathan recommended.

Larger homes typically command higher prices.4.

I know this is a higher mortgage, especially for a first house, but does it make sense?

I've owned my rental SFH for 1.5 years, and noticed my property tax is significantly higher than my neighbors' properties with similar square footage and conditions.