Large,40 floor, cylindrical shape hotel on the end of a shopping mall adjacent to (another) shopping mall joined to the Shinkansen station... so very convenient and easy to get to from the Shinkansen station. The rooms are pretty spacious, well equipped and all have external views being on the outside of the 'cylinder'. Very large number of restaurants, cafes, convenience stores very near.... but not much else as the hotel seems to be in the business area of the city. The waterfront, china town etc is a few stops away on the JR line.

My wife and I stayed here for 3 nights while visiting to watch the World Cup rugby. Location is excellent and only a 15-20 minute walk to the stadium (NB there are 2 stadiums in Yokohama) and there is a bus directly to the hotel from Haneda Airport. We picked up a Fox pocket WiFi at Haneda which has been great so far.
We were on 22 floor with small twin room and smallish bathroom - all adequate. Beds were pretty hard. Nice view towards stadium. Literally hotel is 5 minute walk from Shin Yokohama station and easy to wheel luggage there when we departed. We did not eat in the hotel. One morning we took blue line subway to the waterfront area - very straightward and wondered around Chinatown and the waterfront area. Not a lot to do/see in Shin Yokohama area but lots of restaurants/bars/coffee shops.
We were there for a purpose and it served us well.
Very easy checkin and checkout. Fantastic smooth lifts in the hotel. Hotel connected to shopping complex with large food supermarket in basement floor. There is one coffee shop that stays open late towards the back of the shopping complex.

I am staying here as part of a tour group. After the match we returned hoping to get a drink. The top floor bar was full and people were queuing. The lobby bar, however, was practically empty. The sign, see photo, suggests that it's open till 11pm. The photo was taken at 10pm! So, they don't want us here.
Earlier we went to take advantage of a special offer to watch the two earlier games on the big screen (they had a big screen in the Banqueting Room with a bar and snacks) before heading to the stadium.
First match kicked off at 1.45pm. They were going to open the Room at 3pm! We made alternative arrangements.
This is Japan's biggest sporting moment until the Olympics next year and the whole country, with the exception of this hotel, has embraced it. By all means stay here but don't expect them to understand or recognise why you're there.