We stayed in the main tower. Our room was on the 25th floor. Great views of Tokyo. Not much going on near Shinagawa area. Cinema, Sealife Park etc under hotel.

The hotel is a good value for money. Just across the street from the Shinagawa station, it is probably one of the most convenient hotels in Tokyo. Upon check-in, we were mistakenly given a standard twin (we had reserved a corner room), and unless you are travelling with minimal luggage or don't mind cramped quarters, I would recommend getting a corner room. There seemed to be a range of rooms, with the cheapest ones being older, on lower floors, with motel-like bedding and decor, and the higher floors more recently updated. Bathrooms are standard plastic pre-fab like in many Japanese hotels (even some of the nicer ones, surprisingly). The rooms were clean and properly looked after in the way that most Japanese hotels are, though as we neared the weekend, it was clear that the operation was a bit of a factory, checking people in, getting their luggage to the rooms, providing advice...all attentive, but in a generally competent way. You do not necessarily feel like you are getting personal service here.
The hotel is a good one for travelling with children, it is connected to an Aqua Park (guests get a discount) with dolphin and sea lion shows, there is a movie theater and a bowling alley as well. Lots of good places to eat, though none that you would travel to Shinagawa to visit. There are no department stores in the neighbourhood though there are a lot of shops. The refrigerator is empty, with the idea that you buy your drinks and snacks at the nearby 7-Eleven or other convenience store or vending machine.
All in all a good experience, and a good value for money as long as you are not expecting luxury.

This hotel is right next to one of Tokyo's 3 large train stations, a huge advantage for who needs to travel inside Japan. It is very large, with many shops and restaurants inside the complex. But it also betrays its age. Rooms, even in the premium-priced Annex Tower, are nice but vey small, and decoration should have been redone ten years ago. Service is pleasant, with good knowledge of English by Japanese standards, but there is neither a porter to help with luggage, nor a concierge, two unfortunate omissions at this price level.
In summary, I will try to find a better option next time around, still very close to the station. But, if I can't find one, there is nothing wrong with staying here again.

A very nice hotel, the rooms are kind of small but it is definitely a great value. The staff is very nice and helpful. The rooms are clean and the location is great! Right next to a major JR station.

One of the downfalls is Shinagawa is very big on Shinkansens and JR lines but not as strong with metro or tokyu lines.