From Lee Garden Apt. Hotel To Beijing Capital Airport by subway, Train or Bus

Hi, as your flight will leave at 01:00, you'd better get the airport three hours ahead.
As for the transport, I suggest you walk about 900-1,000m to Wangfujing MTR Station to take MTR line 1 to Xidan, or taking taxi to reach directly, where you can take airport shuttle bus line 2 to the Peking Airport directly. The whole journey takes about an hour or a little more.