There's certainly other aspects that you need to consider such as pricing, quality of photos & overall listing, is it clean/repairs are done, if there's tenants are they being decent to people during showings, are you requirements reasonable etc... 

Some contractors have insurance, some are 1 man band with no overhead, quality of work factors into cost, level of finishes.We created a calculator for our clients to use here in Chicago, specific to our renovation pricing, but even that is just a guess based on some assumptions.If you can find a quality general contractor, pay them like @Bruce Woodruff mentioned, and it will make your life so much easier...you may eat into some of your profits, but being able to rinse and repeat with someone you trust is priceless!

Have you ever had difficulty getting a loan with poor credit?

Managing contractors and verifying quality of work/timelines can kill a deal.

Are their listings detailed with good-quality photos?

Etcwith the poor search functionality, I do not blame newbies for not using it.  

To avoid going through the same poor experience, keep reading.Even if someone gives you a referral here, do NOT make the mistake of assuming that the PMC will meet your expectations, just because they met the expectations of the referral source.In our experience, the #1 mistake owners make when selecting a Property Management Company (PMC) is ASSUMING instead of CONFIRMING.It's often a case of not doing enough research, as they don't know what they don't know!

This one is/was a C- or worse at the beginning and now they would be about a B quality buildings in a Cish neighborhood.

This one is/was a C- or worse at the beginning and now they would be about a B quality buildings in a Cish neighborhood.

It was previously managed (poorly) by Vacasa.