Currently in the paleontology department's photo-laboratory, which is also the access path to the microscope lab. I'm the only permanent occupant, but almost everyone in the department wanders through here during the course of the day, and it's right across the hall from the break room.
I find it suits me quite well - makes it very convenient for me to make myself tea and such, and people wandering through are rarely a distraction, if they don't talk to me. But it's very handy, because I can catch people readily, and they can find me so easily, that despite me being the only IT person in the department, they never feel pressure to 'catch me while they can' and unload rafts of problems all at once, nor is it an 'adventure' or 'intrusion' to find me, since the door is always open and it's not my personal office, but a public room that they also enter for many other reasons. And on the occasions that someone else comes in here to work, they have a specific task of some photography to accomplish, which they complete and leave, so I don't have to listen to someone else's telephone conversations and weird personal habits on a daily basis.
Such a personal corner in a public place works better for me than any other office environment I''ve ever used.