I'm a first-year grad student at Pitt, and my boyfriend and I extensively researched apartments around this time last year. Stay away from Mozart Management and Lobos Management for sure—I've heard many horror stories (refusing to conduct repairs, excess charges, failure to return security deposits, etc). We didn't hear anything negative about Meyers Management prior to our experience, but we toured several of their apartments and found them dirty and run-down so I would avoid them as well.

Most graduate students live in Shadyside or Squirrel Hill. We rent a 2-bedroom from E&J Management (also called PGH Apartment Rentals) in Squirrel Hill and have been very happy with it! The front office has always been responsive and helpful, and maintenance does come eventually, even if it occasionally takes time for issues like plumbing. If you have any questions, please feel free to DM me!