They can be standalone, but you'd want to have something that communicates through the internet to your mobile device. 

They handle all pre-stay communication, booking, calendars and payments for 13% of nightly rate if you wanted to check them out.  

I do not recommend you engage in any further communication with these two from now on either.

That means professional communication.

I also texted them & emailed them reminders to set up there payment method in Cozy several times throughout the month of December (all of our direct communication up until this point is through text).

Maybe try multiple forms of communication or offer to meet to have a coffee?

Work things out with people with good communication and respect you can probably eliminate a lot of bad juju.

There was also a reminder that the majority of the cards can come in declined (pending verification) or with low limits and that their processors were trained in communicating with underwriters and would work to get the most out of each approval and overturn and denials with an appeals process that could sometimes take up to 5 weeks. 

@Lucas Carl When you say self-manage, I assume you mean coordinating cleaning/maintenance remotely while continuing to handle guest communication yourself?

I do a walk through with someone, communicate desired renovations and then have to go type it all up with accurate pricing and that takes a few hours.