Oh OPI - you and your amusing polish names. Though I suppose with the number of polishes that OPI have released (more than any other modern brand?) they would've likely run out of names if they'd stuck to anything more themed or traditional!
And don't get me started on Nails Inc's annoying habit of reusing polish names, sometimes 3 times...
So Berlin There, Done That is a mid-toned taupe creme, it looks purple-ish in shade and milky coffee in sun. BTDT is unsurprisingly from the Germany Collection back in 2012.
Application was good, swatches are 2 coats, no top coat.