You know, I really have to echo just how great of a locale Prague is. Firstly I think the art direction is really enriched by the sense of history and layering - old buildings retrofitted with new technology. On top of that, the sheer depth and interconnected nature of everything is just dizzying - it takes some serious talent managing something this complex throughout development. In general I think I have a pretty good sense of direction, so when I say I have legitmately gotten lost in the maze of ducts and tunnels that run under the sewers or throughout the bank, I'm not kidding around.
The whole place is such a joy to explore and the environmental storytelling is so good that at times I wish this were the whole game and that the dialogue would just take more of a backseat. I've played ~35 hours and am nearing the end of the game and still the amount of little areas I have NOT explored is just staggering. This will definitely hold up to several playthroughs, no doubt about it.