Small Home Office Idea - Good lighting is essential in any office. Installing lights directly above your desk, like on a bottom shelf, will make sure you’ve always got enough light, even if you don’t have a window nearby.
Retractable baby gate at top and at bottom of the stairs? Completely out of the way when it's not needed! (The retractable baby gate IS certified for use at the top of the stairs. Fitzgerald Reveron Isaacs , you will need these!
Accessories - Retractable Safety Gate, Retractable Baby Gate, Retractable Dog Gate, Retractable Cat Gate or Retractable Pet Gate. The Stair and Banister Adapter kit as well as accessories are explained here.