What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

My question is whether I have to allow new tenants to be section eight.

I have a google voice and certain sites recognize my voice number and wont allow me to use it.....so Zillow might be one

A locked thermostat at 70 is not going to fly well with many guests that are used to 68 at home.

I wanted to refresh the paint on the front doors and shutters as well.

Since ADU rules were liberalized by Seattle in 2019 (one attached + one detached allowed on any single-family lot, no owner-occupancy requirement, no restriction against separate sale). a number of spec builders in Seattle have been building what may look like a townhouse triplex but is legally a single family primary homes plus two ADUs, one attached and one detached. 

Rategain is a new one for me and I wonder why you chose them over other PMS that are well known?

We are in central PA as well and while A/C is a plus, most homes do not have it and rely on window units for the dog days of summer. 

Also, most decent STR property managers will be happy to offer projections for properties, or even realtors who do a lot of STR business as well. 

Well, you need to start by buying value add properties.