Start with these highly decorative chairs available on Interior Internet. They are so unique and both industrial and feminine at the same time (made of metal) (H: 835mm x W: 600mm, seat height 410mm)
Cover them in a fabric of your choice but it should be neutral and solid - like a cream linen.Pair the chairs with a wide open, inviting sofa such as this one designed by Antonio Citterio for Flexform. It's so inviting and airy - a perfect complement to the decorative side chairs. (Groundpiece, sizes various)
Same rules in fabric choices for this guy - go with a neutral complementing weight fabric as the side chairs (for instance if you go with linen, stay with a different weight or cotton blend - don't mix wool and linen)
as a coffee table use two tables similar to the ones below - these are great because they have a glass top and open bases which keeps the look on the lighter side (Pair of Vintage Brass End Tables from Woodson & Rummerfield's)
For lighting, use a large floor lamp that functions as overhead light (again, move the heavy stuff away keep it light!) I love the Arco Lamp. It's available through Design Within Reach (Arco Floor Lamp; Measurements H 95" max. Shade Diameter 11.5" Base H 21.5" Base W 9.5")
Flooring
Ideally in this amazing loft space there are gorgeous hardwood floors. Ideally they would be stained a dark walnut color with a soft sheen. The furniture could then float on a simple sisal rug. These are available many places from Stark Carpet (to the trade) to Pottery Barn.
Windows
Simple panels would be best. Go for a dark gray natural fabric and plain blackened iron or bronze hardware with no finials.