My penthouse-cave is part of our living room. Here are most of my basses; my wife likes them as wall decoration. My amps are also here. My man's cave is shared by music - currently represented by the Alien, a Keyboard, some mics, and an interface - photography, and books. NO treadmills or other torture instruments!
This is where I spend most of my time when not working. Iv been building this room for approx 6 years and feel like its done for now. Love winter when I can just come in here and play/listen to music all day with no guilt ha ha