Henn na Hotel's USP is that it uses (in this branch's case) humanoid-looking robots at the reception for check-in (don't panic, there are real humans just a phone call away). Elsewhere a cute desktop robot will tell you the weather (perhaps!) and there are nifty clothes-deodorising closets in the rooms, which come with enormous LCD TV and smartphones.
There are several other branches around Tokyo, including one near Tsukiji.