Most developers who I've known are easily-distracted from being in the "zone", and I include myself in that list. I'm always more productive when working remotely, where I can control my work environment. Second in order of preference is having a private office. It doesn't matter if it is little more than a closet with a door. I've been in nearly every scenario described by folks here on HN, and the most toxic was working in an open office space, and having an exit door behind me, to boot.