cons,check with shop as you may need to buy cleaning and sealing agents, get them to specify, as then they are liable, as some polished porcelain needs sealing if not it will irrepairably stain. black tile in hall hard to keep as any moisture turns whitish. the bigger the tile the better your floor has to be, hence large tile may require levelling of floor. recommend flexi adhesive, dearer but best,tiling per yard depending on sealing or not will cost 20 to 30e. only buy tiles of RP ., pros, lovely tile, long lasting, no prob once done right