Start with what features you want and work backwards...- Emails dripped out on a schedule (booking email, check in email, checking on your stay, checkout, leave a review, etc)- Auto-assign cleaners- Managing a central pricing and booking calendar- ???

The ventless have 2 safety features to mitigate co2 poisoning, but I have to go with vented gas.

I also used the message template features quite extensively.  

I’m not convinced that providing a washer/dryer connection will put any more rental income in my pocket and the home has other desirable features so I’m not worried that the lack of connections will be a deal breaker for a prospective tenantThoughts?

If you're portfolio is smaller Buildium is a good software that has all the features you described.

They have an email list called deal makers where experienced folks refer out their contractors even teams.BP has started a contractor referal feature.   

I manage my own County Tourist Tax: 6% (airbnb now allows hosts to charge it to guests, nice feature)With that you can create an excel spreadsheet to get the numbers.

Are there any features that should be included to draw additional value (social areas/patios, bike racks, permanent grills)?

Usually while legally sufficient, these templates have absolutely no asset protection feature.

It is hard for a new platform to draw consumers, and I fear that once/ if they do they'll start selling premium features to agents that will more or less make the free version less valuable.