I pulled a list of tax delinquent properties in my area.

I currently have one property listed on Airbnb.

I considered SFH where I'd rent out all the rooms and keep one to myself, but this seems risky since I'll realistically be away for months at a time and couldn't manage the unit/other tenants.Then I came across some listings that appear to be hotel rooms for sale, with basically the facilities I need (a bed, toilet, kitchen), a price point I can handle (270-500k$, I'd do 20% down), and fairly high HOAs (~1500$/m?).

Does this mean there is no downside to listing it for the maximum price of $4313 per month since the tenant would likely be paying the same amount no matter where they chose to live?

If you're unable or don't want to list them as an STR. 

There was a flip on the market where my clients offered $200K below list price because the flipper didn't even touch the systems.

They will have lists of people that have been looking at THEIR rentals and may be willing to help advertise yours for a fee (assuming you want to manage it yourself). 

Here is a list of reasons:1) The value added by the ADU addition is often significantly less than the cost of adding the ADU.

I'm looking for opinions on flat fee listing services.

Fell out of contract 2 weeks later and I immediately got in touch directly with listing agent.