This desk has just the right amount of room. I was able to move from a giant desk and a filing cabinet to just this desk. There's just enough space for me to push my chair in a bit when I'm not using it so the whole desk area takes up very little space when not in use.
I do recommend getting a mount for your monitor if you plan on using on to help save on space.
I also suggest getting some cheap lightweight crafting wood and cut out some pieces for your mouse and keyboard. I put some anti-skid pads on the bottom of the wood and use it to let my mouse and keyboard hang off the sides of the keyboard tray when it is extended (see pics). With this trick it doesn't matter how much space your keyboard and mouse take up, otherwise the keyboard tray is kind of small.