I have stayed at the Washington quite a few times when there have been offers in Jalan. I have always had a good sized room at a great rate. However, I have quite a few friends that have stayed there and said the rooms were tiny. I don't know if it's the way I booked or luck, but it's worked for me. I think I have had corner rooms twice, with plenty of space and last time I had a fantastic view both out to the Park Hyatt and across to Roppongi.
Staff have always been really friendly and helpfull. It's also nice to visit some of the Skyscraper restaurants/Izakaya's in nearby buildings, such as the Sumitomo building (I've often picked up offers in Hot Pepper magazine). It was also fun nipping up the Metropolitan building whilst my washing was going round. It's also very handy having the convenience store in the basement.
It is a little bit of a walk from Shinjuku station (south exit is best) as are all of the hotels here. I really like the area though, and it's not far to the electronics district and a perfectly acceptable walk to the centre of East Shinjuku for shopping, eating, theme bars and places like Golden Gai. From my experiences this hotel has been great but I would cretainly enquire about which room you get (or maybe ask for a corner room).
Room Tip: Maybe ask for a corner room?
See more room tips
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC