You CAN spend even more money and get battery backup with this mode... so if the power goes out you can have a small amount of energy to run things other than the HVAC or stove... like a medical device.

I tried to add a link to his name but it appears I can't on a cell phone.  

If the young person does not have much of a credit history, I'd ask to see 12 months of cell phone or internet bills to get an idea of their payment history. 

Make sure you get the code and put it in your cell phone as a note for the tenant; you don't want to wind up there for an inspection and find out the tenant forgot to leave the alarm off...

When you can call your attorney's cell phone at 2:00am after being arrested for jaywalking, that peace of mind is going to cost you.

But I can't confirm the number is hers (it's just what was given to me by previous owners, could be a typo), nor do I know if it's a cell number or landline. 

Do you provide your personal cell or a separate business number?

Currently I utilize texting and when necessary personally call individual tenants who don't have cell phones when I need to notify an entire building of common information.

I have one door and my primary residence that I rent out the upstairs.In my rental over the last year I have had the following issues/calls:In the first week (when I think you will get the most calls from tenants):Toilet seat was wobbly (It was-very easy fix)Toilet seat wasn't flushing (plastic trip device broke. $10 fix)After that I had 2 calls over the course of the year:The AC unit wasn't draining properly and was leaking out into the house.

She said that she would deposit the rent next day (8/18/16).However, she didn't deposit the money.I tried to contact with her again, her cell phone would not take any voice mail.I found her emergency contact person, she said she will try to reach my tenant and ask her to call me back.