Great value for money!
Good amenities: There's a microwave, hot water dispensers, colder water dispenser, teas and coffees available on the 2nd floor lobby/reception area for use 24/7. A coin operated laundry room is available for use to the right of the lifts and a drinks vending machine can be found there too. There's enough space to sit and work or eat in the lobby too.
If you arrive early there's a luggage storage area you can use until check in time.
The room is clean and functional. A good amount of plug sockets and a small foldable chair and desk next to the TV can be used as a functional workspace. Hand wash, soap, shampoo and conditioner is provided and the shower is nice and spacious. A/C has cooling/heating/fan options.
I will say that the mattresses are rather hard if you're used to softer Western beds though.
The location is great - very near 2 stations for ease of travelling around Tokyo and if you're lucky and your room is facing the port, is a lovely view to