In total, I probably spent 2 hours painting, 3 hours cleaning and about $60 on cleaning supplies. 

Low supply, high demand, competition, and expensive property.

Also, for this time of year, it feels to me like we have a bit of a higher supply than demand which is forcing prices to ease.  

http://www.har.com/content/newsroom/Houston Real Estate Highlights in October Single-family home sales continued their post-Hurricane Harvey rebound as volume rose 7.5 percent year-over-year with 6,381 units sold;Single-family home sales remain 2.8 percent ahead of 2016’s year-to-date volume;Total property sales increased 6.6 percent with 7,614 units sold;Total dollar jumped 10.8 percent to $2.1 billion;The single-family home median price rose 3.9 percent to $226,491, which represents an October high;The single-family home average price increased 2.7 percent to $285,858, also the highest level for an October;Single-family homes months of inventory grew year-over-year to a 3.9-months supply, but is down from a 4.3-months pre-Harvey peak – the result of a surge in consumer demand for housing;Townhome/condominium sales rose 5.8 percent, with the average price down 1.1 percent to $195,393 and the median price down 3.1 percent to $153,000;Leases of single-family homes rose 13.6 percent with the average rent up 2.8 percent to $1,776;Volume of townhome/condominium leases jumped 34.8 percent with average rent up 2.9 percent to $1,533.HAR still encourages anyone who has housing available for temporary occupancy (up to 12 weeks) to please post it on our Harvey Temporary Housing page at www.har.com/temporaryhousing to provide housing to those in need.

Do you have any tips on how to prevent renters and cleaners from taking all your extra supplies (like how people take shampoos at a hotel)?

I'm renting out a condo and a prospective tenant asked me if I would supply the air filters for the unit's HVAC system. 

Or generally speaking, prices in the area went up, due to limited supply and high demand.With the Amazon HQ2 it won’t be much different.

There is also an incredible amount of development in the area which has caused the rental market to soften a bit (average rents in 2017 dipped as Supply exceeded Demand). 

If he's stealing and installing at your residence can Lowe's not come after you and your residence (subrogation)Or are you supplying all and paying for all and he's just the installer?

Zillow simply supplies the public some good information, but definitely flawed information.