This is a rare opportunity to sleep within one of Tokyo's most eccentric architectural landmarks. The two apartments – one has one bedroom sleeping two, the other has two bedrooms, sleeping four – were designed for maximum wonderment, with contrasting colours and textures and oddly shaped rooms. Both have washing machines, kitchens and hammocks. You need to book a minimum of four nights.
The drawback is that the units are rather out of the way. From JR Mitaka Station, take bus 51 or 52 (¥220, 15 minutes, every 10 to 15 minutes) from bus stop 2 on the station's south side and get off at Ōsawa Jūjiro (大沢十字路); you can see the building from the bus stop. Not all buses go this far, so show the driver where you want to go. Bus 1 (¥220, 25 minutes, every 10 to 15 minutes) goes here from Kichijōji Station (south exit, bus stop 3), alongside Inokashira-kōen.