Guardian Property Management of Brooklyn, Common Sense Properties LLC

Does anyone have experience with Guardian Property Management of Brooklyn/ Common Sense Properties LLC. Their website is managebrooklyn.com .

I recently moved into a building this company manages and am a bit thrown off and confused about their company, who they are, and the services they provide. I have had a negative experience over the phone with someone there, and cannot find any kind of information about the owners, managers or the company online aside from their website, which doesn’t say much at all.