Hi @Andrew Rosenberg, Google Reviews are one way to tell who is reputable in property management. Not just the reviews, but the owner responses to reviews.
I suggest calling to see if they answer their phones, texting them if they have that capability (most do not), and emailing them to see if they respond quickly.
Check their website. Do they clearly identify their services and fees, or do they want you to "get a quote"? If it's the latter, they are salespeople, intent on closing a sale, vs. a professional service provider with a clear list of services, fees and accountability.
Check for hidden fees. Agreements with vendors are a big one. Charges to tenants are another big one. Most PM companies hide this in the fine print of their Management Agreement.
Ask if they operate in silos. I.e., 1 area for maintenance, 1 area for marketing, 1 area for financial statements, etc. Most PM companies operate this way, and the end result is a lot of frustration if you're trying to understand something on your owner statement.
Also, @Drew Sygit has to say "you get what you pay for", because that's the only defense for over-charging for services.
Our firm charges the least, offers the most and is now serving Colorado Springs. Good luck! :)