I use the Evernote app for this type of thing.

It's free with BP-pro, and offers phone apps for both landlords and tenants.Good luck,Ruoqi 

The Soil Connect app might be helpful.

Rental: the one I kept as a rental had a PP of $55K and cost $140K to rehab.

I don't think you can get previous landlords with a zillow app. 

I have found  mobile app called Clarem (www.getclarem.com) useful to build a plan and stick to it. 

Be sure your marketing and your application include whether you have a pets/no pets policy; assistance animal policy; ALL adults must complete application and will be named on the Rental Agreement; utility responsibilities; SD requirement; when and how various funds are due (app fee, SD, initial rent, etc).

There are apps but a spiral paper notebook is fine.

My apprehension is that after the initial furnishing, app process, move in, there isn't much to do.

All I would need to do is clear out the basement and post it on the app.