I would love to know what the flooring is too!

This is a cut and polished exposed aggregate concrete floor. It uses an off-white cement and selected and graded (sized) aggregates (mostly basalt and quartz) that have been exposed by a series of cuts/grinds of increasing fineness. The cut surface is then sealed with a polyurethane. If you have a look at our Glen Iris Residence project you can see that we used a bonding agent in the concrete which mean that it didn't need a sealing coat post-grinding, although the final effect is a bit more of a matt one than here.

Love the floor as well. How thick is the material? We'd like a concrete floor but don't want to cut down the tops of our floor joists to maintain flush with adjoining hardwood floors.