It's due to the vast expanse of window which allows me a grand view of the sky and buildings in the distance. I can see rain roll in, clouds dance across the sky, the lights of the city twinkle in the distance, the colour stain of sunsets, birds sweep past (and they seem terribly fond of my roof)... That and the fact that I can see the backyard of the neighbours across the street, and they have a tendency to firetwirl in the middle of the night as I sit at my desk.
And that's not to mention the view of the sunset from the balcony...