It may sound strange, but my happy place is my home office. It's where I do most of my work, but it's also where I read books, watch movies, and just relax by myself. It's the only space in this entire world that's all mine, and there is no place where I feel more comfortable. It's where I am right now!
I actually just moved a bunch of stuff around in my house and switched my office space to a room upstairs. It's currently a disheveled mess, with boxes of stuff and stacks of books everywhere. But that doesn't matter because it's the feeling I get in my own personal space that matters more than anything concrete about my office. Sort of like Disney World; what I love best about WDW is the feeling I get when I'm there, and how my family seem to be our best selves when we're there, not the rides or the attractions or the food. My office gives me a warm "I'm home" feeling even when I'm knee-deep in work.