I like to cube in my room, at my desk the most. I think this is the least effective way to practice for competitions though because it is too familar, too comfortable, and too quiet.
I think it's much more effective competition training to practice in public, such as at a coffee shop. I actually ask my roommate to always disturb me whenever he comes upon me practicing for BLD. He usually either shoots me with a nerf gun, makes really loud noises, or throws things at me (nothing heavy like a book or chair haha, but something that would disturb me enough to throw off my concentration). I find this helps to simulate the competition atmosphere of having to force yourself to still focus, despite all the distractions.
