This is a well-located, well maintained hotel with rooms that are on the larger side for metropolitan tokyo, and in fact would be decent sized in most Western countries. It is a very very large hotel, and does come across a little bit impersonal. Guests in standard rooms, not on deluxe floors, check in and out through kiosks--we never really talked to any hotel staff during our 5-day stay.
The breakfast was kind of lame. They had the expected things, but the quality was disappointing. More like campus dining hall quality then four-star hotel quality. Hard to believe, but we had a much nicer breakfast in a three-star hotel in Sendai right before our stay in Tokyo.
The restaurants in Dome City are also only so so. The bakery was okay but not to the standard you might expect from other bakeries in tokyo, and the dim sum place was substantially worse than PF Chang's.
We did think the hotel was good value for the price we paid, and the convenience store on the second floor was very...convenient. The Korakuen garden is just around the corner, and well worth a visit if you're here. We will most likely look for a hotel with a somewhat more boutique atmosphere on subsequent visits, but this is definitely a reliable choice where you will be pleased with your room, and very convenient for attending events at the Tokyo Dome.
I would suggest not opting for the hotel's breakfast and instead walking over to the nearby Wanna Manna restaurant for Taiwanese breakfast treats.