My apartment is detached completely from the outside world. My windows go into a hallway, as does my door. While extremely cozy, I often feel like I am underground or in a vault. it is an ideal price, size, and location for my life, but I can start to feel early signs of cabin fever when at home for too long.
The thing I miss the most by living in my underground home is the lack of running water. There is a stream right outside the back of the building, but I can never hear it. People will talk about gigantic storms from the night before at work while I just nod; being oblivious to any meteorological event during my slumber.