Make sure you get a security deposit and set expectations from the beginning (ie: landlords don't replace light bulbs, batteries, etc). 

All the sensors and the keypad run of batteries and the base unit plugs in but has a battery backup.You would have four entry sensors for the four doors, at least one glassbreak sensor, and at least one motion sensor.

Examples: replacing burned out light bulbs, furnace filters, batteries in doorbells, etc.

Regardless, a lot of basement/foundation contractors can install a battery-operated sump pump for exact scenario of 'if the power goes out'.

Basic issues could be as simple as them calling you on a Saturday night because the remote controls battery went out or the internet suddenly stopped working because of the rain.

I have been a landlord for more than 3 years and when I started to watch and listen to Brandon, it motivated me to buy 3 more properties this year, and I am still going like the rabbit hitting the drum with the Energizer battery!

We change the batteries once a year and in case the batterris die or lock malfuntions, we have a key in a lock box attached to the house somewhere, like the  water spicket or gas meter.

Another vote for YourPorter.I even created an offplatform website through their interface, though I am trying to figure out how to best integrate electronic lease agreement signature.The only thing I am trying to figure out is their Cleaning module - how best to send automated communications to my cleaner.

I haven't used SimpliSafe, but I know Arlo has a two week battery so you can mount it outside and then take it down to charge while you are there. 

I just finished paying for a electricians to install smoke alarms and carbon monoxide alarms to bring my first property up to code but It dawned on me that I could have used battery powered alarms, is either much better than the other?