I booked my parents into the Washington (fooled by their flashy website) and myself into Sun Members for a cheaper night's sleep. Turns out, my room was better than theirs!!! Don't let the nondescript exterior put you off. The room was big by Tokyo standards and featured little extras such as fancy bedding, a full raft of free bathroom amenities, stocked fridge, small table and chairs etc. Really happy I booked this hotel in the end - walking distance to Shinjuku Station and easy access to the Government Offices building where you can ascend to the 42nd floor for a view over inner-Tokyo. Definitely recommend.