Also, you might live in an area with more modern house lots than I do, so you're less likely to have some of the issues I listed above. 

There’s a lot of aspects you should keep in mind before you get into this space.  

Unless you are short on space.

One of the units (ground-floor) includes the basement in its living space.

There is no "emergency", if it's broken for a few days buy them a few $15 space heaters.

One of them is moving in from out of state cause he gota new job so family has to move, the other is local. both have families so am having a hard time deciding who to rent to.The person from out of state currently owns a house himself and is planning on selling so should know how to take care of a property, at least that's what I think.The second is looking for a bigger space for his family.

And yes, I have a base understanding of how to value self-storage; thank you to BiggerPockets content and networking through others that have been successful in this space in my area.        

However, it sounds like it's fully functional and just missing some modern safety features.

For example, 3'0 doors instead of 2'6 doors (space permitting).

There are more and more lenders allowing for STR's on 30-yr products, and the space is becoming more competitive, which is great for investors!