I really like the Grand Hyatt, which is close to the Forbidden City, so you may consider this property as well.

While the rooms aren't "Pen" style (and I've only stayed at the BKK Pen), they are quite nice. No major complaints, except they are a tad small (Tokyo sizing?)

What I continually rave about is the awesome pool & fitness center. The pool area is set up like a tropical lagoon, the pool itself is huge -- bigger than Olympic sized, and is a funky shape with waterfalls & underwater music. Plus it's WARM! The super-high ceiling has little lights which change color and the lighting level for the pool area is "early evening" ambiance. The hot water/jacuzzi in the locker room (one in the men's & one in the women's) is maybe 15' x 15'. Top quality exercise machines.

Had a great meal in the Chinese restaurant. Met the Chef (Jack) -- turns out his brother is the head chef at the Four Seasons SIN.

The Club has quite a spread at breakfast and dinner, so we really didn't have to eat out in Beijing.