Or on another end,
Hotel Arca Torre Roppongi. Located right front of Exit No. 3 of Roppongi subway station, right around crossing of Roppongi where considered to be the center of Roppongi.
Looking at availability, a single room with breakfast during month of August is from JPY 5625 to 6675. Cannot beat this deal if you want to stay at the center of Roppongi! This is no way seedy hotel nor “love motel.”