I adore that circular floating staircase! Circular staircases are my favorite design feature in a house.
I always like to look in magazines to see how each one is a little different. It's fun how you can take one element in a room and though it can be broadly described as the same 'feature' in many other houses it has a completely different look and feel than any other based on it's design.
Yes spiral stairs are a trend nowadays and we really implement them in our designs.