With this in mind, doing the market research well is key and I can share with you some tools / websites that i used for my own (for example idealista data or national stats), so you can check in which cities population is growing (just a few), unemployment rates, rent/buying $ per m2, etc.  

How accurate are websites like Airdna?

Put it in a short term treasury fund while you take a few months to read a dozen books from both the biggerpockets.com and bogleheads.org websites.

It is all on the SEC edgard website. every reg a offering is public record.

Quote from @Charles Evans: There are websites that estimate market rent, but they can be off quite a bit.

I have a hard time visualizing things myself so using Alex has been a god send, here's her website https://www.cheatsheetdesign.com/ It's around $400 for her help and personally is worth it to me just to save my time!

I keep monitoring the properties in the Cleveland Heights area (where we are looking to buy) on Zillow and other web sites but I am sure there are other ways of finding properties.

Does physically going to downtown reveal more info than the Cook County Circuit court website?

The websites were up and down all the time.

Do you have a website?