My tiny studio's open area is more or less the minimum size SteamVR will allow for standing play, and it's still a wonderfully immersive experience. Heck, even

My tiny studio's open area is more or less the minimum size SteamVR will allow for standing play, and it's still a wonderfully immersive experience. Heck, even the most physically immersive VR game out right now (Boneworks) encourages sitting play-- so maybe the huge open area isn't that necessary. However, my definition of "tiny" might not compare against your definition of "tiny" well.