The answer about how to do laundry, if you are staying at the Grand Hyatt, is that you get cheated. The concierge was only willing to recommend one laundry -- the one in the mall under the hotel. We just used it and while it is considerably cheaper than the GH's price, it is still outrageous. We just paid 300 yuan (USD37.50) for a week's worth of underwear and T-shirts for 4 people.
Given that one can get a dinner in a decent restaurant in a good part of Beijing for about 50 yuan, or rent a taxi and driver for an entire day for 300 yuan or less -- well, you get the idea. However, the laundry did hang everything, and I mean EVERYTHING, on hangers for that price. Anyone need 50 wire hangers?
Simple fact: the concierge at this hotel will pretty much ONLY recommend something if they get a kickback. I would guess that is fairly universal throughout China.