This is the Captain's ready room of the Potemkin, an Excelsior-Class starship that was mentioned several times in 'Star Trek: The Next Generation'. It was one of the previous postings of William Riker, before being XO on the Enterprise.
Given the limited space on an Excelsior-Class ship (when compared to the much larger Galaxy-Class), the ready room is located on deck 2, right next to the Captain's quarters. It is thus a middle ground between the integrated office inside the cabins of earlier Constitution-Class ships, and the larger independent ready rooms directly connected to the bridges of later designs.
There are two entrances to the room: The main door is a direct access and leads to the ship's corridors; while the secondary door, located inside a side alcove, leads to the Captain's quarters. Thus the ship's CO can move freely between their living spaces and this work space when they're not needed on the bridge.
The commanding officer of the Potemkin is passionate about early Earth space travel, which is why most decorations focus on that particular topic. The Russian sword placed next to the desk, on the other hand, is a tribute to time period of the ship's namesake, Grigory Potemkin.
The Excelsior-Class model used was made by Chris Kuhn, with texture and material modifications by myself. The painting of the Apollo-Soyuz mission is by Davis Paul Meltzer for NASA in 1975. The painting of the Phoenix warp ship was done by Mark McHaley for the book 'Star Trek: Federation – The First 150 Years' in 2012.
Created entirely using Free and Open Source Software (Blender and Inkscape) on Ubuntu Linux.