S5 Max here - used the mopping function a few times (hallway has tiles, kitchen diner is fully tiled and utility is tiled). Although it does a good job mopping, it isn't perfect. If you have stains on the floor, such as coffee / tea, it won't really budge that, but for mud and such it removes it pretty easily. It does multi floor mapping - but yet to test it upstairs, but it's something I'll get around too at some point! Love mine, it's been a really impressive addition to the house.