This place is in Inglewood CA where prices are going up like 8-10% per year, so it will (almost) definitely appreciate considerably over that time (Rams/Chargers stadium being built, Clippers moving in, new entertainment developments, overall gentrification etc. 

However, make it very clear that if they stay into September then you will charge rent for that month.You can also consider prorating their rent for whenever they move out. 

You can usually run a few lamps, alarm clocks, phone chargers, etc no problem, but if the tenant wants to (say) use a hair dryer in the bedroom, they might end up popping a breaker.One disadvantage to a window unit, especially if it's on the first floor in a less-than-great neighborhood, is that it's relatively easy for the bad guys to push it into the house from the outside, and then climb in through the resulting hole. 

The only issue with the solar for the power source for the heat pump is that when the heat pumps are needed the amount of sunlight is reduced, short days of winter and night time, it is essential to have a good battery back up to help with the demand. 

Maybe even put in a car charger? 

What online program or website do you guys use to keep track of all your properties and even charge rent through those websites.

How about an outlet for the RV so the owner can plug in a battery charger, water tank heater, etc?  

Point-and-shoot camera (I take a couple hundred photos per property, which uses a lot of space on my phone and drains my battery quickly). 

Then some PM charge a service fee every time they send someone to service the property or if they go to inspect the property - in other words, you might get nickel-dime'd with all kinds of other fees, that could easily raise the "PM fee" to 12%+ (we once got charged $45 service fee + $9 per battery to change the smoke detectors batteries at make-ready).Regardless, you need to factor in at least 8% PM cost, even if you self manage (after all your time costs too) as there might be a time when you might want to (or be forced to, like sickness or old age, or desire complete passive participation) to be completely hands-off and you'll need a PM.

Downside of these - batteries die, and not always reliable in very inclement weather.