Your only option besides the ugly window mount units is probably to use a "portable air conditioner". Like the above poster said, you only need a tube (about the size of a dryer vent) that vents to...

Well I think my ceilings are a little too low to do this, but your design is still inspiring!

I -love- your place! I am curious though, how high are your ceilings? You've inspired me to do something similar but I don't think I have the ceiling height.