Bakery Square is a great place to put up guests for a wedding. Free 3hr garage parking, breakfast at Panera Bread (below Springhill Suites), shopping at Anthropologie and Free People, walk to Target, Staples, Trader Joes and McDonalds, and dinner/drinks at Social. Google offices on site.
It's a lovely little place to stay and hang for a weekend. A nice addition to Pittsburgh.