The Radegast Hotel is a beautiful and elegant place to spend your nights in Beijing.
Located in CBD it is (somewhat) near the many night time Beijing attractions. From the moment you enter, you're presented with a grand and luxurious lobby with sky high ceilings, a self-playing piano, and a tasteful fountain.
The rooms are equally nice with quality shower and bath furnishings, a plush couch on which to rest, a host of amenities and other delightful features.
It is also very modestly priced - if booked in advanced. If booked last minute on the other hand, prices would be much higher.