Calendly.com is very good but only offers 12hr max time slots.

I've seen lots of people add laundry machines to ancillary income for their properties, but what other opportunities have you explored?

There could also be outside water spigots or common area water like washing machine.

There are many factors that contribute to the price of water.Washing machines, running toilets and 'guests' are the three that I've seen most often, a distant third is leaky pipes, slow or catastrophic.Tenants will never care as much as you do about the cost of water.  

As such I don't really need to do the "keep your pipeline full" machine style marketing.

The activities of wife with respect to the rental properties included, among other things, cleaning common areas, collecting coins from washing machines, performing repairs at the properties, communicating with tenants, collecting and depositing rent, maintaining insurance policies, purchasing materials for the properties, as needed, paying bills and keeping books and records for tax accounting purposes.

Tax-free Money Machine. 

Get an ozone machine in there.

They'll put machine learning and human review to work for you and send you deals whenever they come on the market.

Keep in mind that the Austin metro is also growing in population tremendously as the job machine keeps cranking out jobs.