There is a terrific website called "padmapper.com" It plots available rentals on a big map of Denver or whatever zipcode you type in, and lets you filter for exactly what you want.
Best of Luck
1041 S Gaylord Street
Denver, CO 80209
There is also a local apartment magazine that lists most of the prominent apartment houses. Try Apartment.com There is plenty of information online. Craigslist is precarious, I would look at one that is professionally managed. If you find a house you like and would like further verifcation. Don't hesitate to contact me. I can verify the owner at least , and advise you further if needed.
Linda Evans Johnson
The Servant Corp
The main resource used these days is Craigslist.com. Another resource would be to find a Property Manager you are comfortable with that knows the areas you are looking in. I do have a resource in Platt Park who works other areas as well. Marty Seldin - South Pearl LLC - 720-235-5015. When you decide that it is time to purchase or if you have other real estate concerns, contact me.
Your Castle Real Estate
1776 S. Jackson St. #412
Denver CO 80210
Direct - 303-669-1246
The previous answer is right on. Craigslist is the way I post my rentals and find tenants. Watch out for the hoaxes, if the price is to good to be true your better off to avoid. I suggest surfing the local public records and find the owners name. I wish you well in your search.
Hope the article below helps you