Great value for your buck. Short stay, and spent alot of time sleeping, but a few points:
Location was very central, close to a couple different restaurants, as well as plenty of good shopping within a few blocks. Also shopping within the hotel, but very expensive.
Service was excellent. From front desk to restaurants to cleaning staff, everyone was very helpful. Everyone I dealt with also spoke very good English, which is not always the case.
Hotel exterior and interior were both very modern and very clean. Especially impressive from the outside the first time you see it, though after a long flight its harder to tell.
Rooms were a bit on the small side, but overall very nice and kept very clean. Bed was comfortable, and you need sleep after the long flight.
Maybe the best buffet breakfast I had while in Asia.
Overall definitely a 5 star, though maybe not quite up to the standards of other Peninsulas. At a certain point it is just hair splitting, but worth mentioning. I would recommend for anyone in Beijing.