I heard lots of good reviews about the Omni William Penn from past con goers. It's a Short 3 block Walk to the Con. Also there's a hotel on the riverfront which is a new hotel for AC Room Blocks, it's the Renaissance Hotel just as far from the Con as the Omni with a nice Riverfront Walk to get to the con or you can walk Penn Ave. If your Lucky Enough to get a riverview room at the Renaissance looking towards the point. It would be a perfect spot to watch the awesome July 4th Firework display that have on the river there. Now the most expensive hotel but probally well worth it is the Hampton and they have Free Breakfast and Free Parking (If your Driving to the Con this is a huge perk as parking at the convention center will cost you big money) and is a relativity short walk to the con, also Hampton as of right now still has suites available for $209 a night plus tax.

Now the cheap Hotel Options is the Wyndham Grand Pittsburgh Downtown which is almost a mile away form the Convention Center. If you like walking long distances to the con this would be your choice and the Marriott Pittsburgh City Center is not a much better choice either. Now the best value for Cheap Hotel Options is the DoubleTree but it's still a good walk to the Convention Center but it's a favorite among the con goers on a Budget.

Now if your looking for Roomies or Looking to Crash With Someone the AC Fourms is a good place to look:

http://www.anthrocon.org/forums/anthrocon-forums/travel-and-hotel/room-share-need-room (This is where people are looking for crash space at)
and
http://www.anthrocon.org/forums/anthrocon-forums/travel-and-hotel/room-share-room-offer (This is where people are looking for Roomies at)