Can you attach a photo? I'm not sure why walnut effect porcelain tiles would be harder to clean than any other porcelain tile - perhaps they mean the texture of the tile might be more difficult? Are they textured for wood effect? Or maybe the darker colour? Or do they have a polished/reflective finish?

I'd have said it depends what your priorities for the floor are. These tiles will prove an incredibly practical floor, dust can be controlled very easily with a quick swipe around of a microfibre cloth mop without any water. Or you can vacuum. Dirt will require a wet mop and more stubborn mess will need a spot clean with a brush. I think the advantage is that you CAN clean them to spotless, and quite easily too. Its not like having carpet in your hall, which does hide the dust and you can vacuum, but when they get dirty its a real problem. Tiles are harder wearing and, I think, easier to clean than a wood plank floor (although engineered wood is great). The downsides are breakages and the cold surface if you don't have underfloor heating. Having said that, if you do have a reflective polished finish in a dark colour this will definitely show up dust and dirt if you are not a regular cleaner. I have sand coloured (lighter) polished porcelain in my bathroom and that lasts about 4 days before it is desperate for a vacuum. But the same is true of wood floors, there are no fibres to catch all the dust and hair and stop it from floating around - I still wouldn't want carpets though. Hope that helps a bit :)