I travel to Japan for work frequently and am used to the Japan standard for hotel size. The number of 4 star ratings here is astonishing for this particular hotel. The room here is smaller than even the "normal small" for Japan. They reduce the size passing the threshold of functional - you will surely encounter the following:
1) No place to put your luggage. I have a 24" hardshell suitcase, which is small for international travel. The only option is to open it on the bed. When you do that, you have NO space left to place clothes that would take out of your suitcase.
2) You will curse all day as you bang into everything and likely leave with bruises. They are scruff marks on the wall, furniture, frig from other guests bang things into things.
3) Sound insulation does not exist, period. Because the rooms are so tightly packed together, you can hear everything next door. I've gotten woke up by the JR line running by, by neighboring guest checking in late and sorting their stuff at midnight and banging into everything, by other walking in and out of their rooms and door locking.
4) Touchy and weak WiFi. With both Docomo and Softbank routers at every floor by the elevator, it's amazing I can't seem to get a stable/strong signal in the room.
5) Floor with mixed smoking and non-smoking room means smoke will permeate into your room whether you like it or not.
Since my March visit, I noticed they cut down the amenities. They now only give you 1 pack of coffee and 1 pack of tea. They also removed the disposable bath sponge but yet do not have wash towel. Bath amenities are large bottles from Pola, which are terribly. They are incredibly drying for your hair and skin - you best bring your own stuff.
Breakfast is not included in the room rate when most of its competitors do. The 1000YEN + 8% tax =1080YEN/day breakfast is as crappy as it gets. Aside from the automatic coffee machine, there is no redeeming quality food items. With endless of convenience store within 2 blocks radius, you can spend 350-450YEN and have a much better tasting bread, coffee and maybe some fresh fruit or salad. Or spend 500-600 YEN on a hot egg&sausage breakfast with fresh coffee.
If you are loyal to the Best Western chain, then your choice is limited in around Tokyo and Yokohama. If you are not brand-loyal, then there are plenty of better choices around. less