hi @what3words. Quick question. We were chatting about you ;) and we wondered how w3w copes with an address on the 4th floor, or th 5th flr of a building? How do you differentiate?
Just like regular street addresses, 3 word addresses work in 2D, so additional information is needed to specify height. 
If you live in an apartment block, you’d give the 3 word address for the main entrance, plus the floor and flat number.
