If you're heading out on the Shinkansen early in the morning this is the place to stay, as it's directly above the train station.
Check-in was easy and quick; the hotel staff are so kind and polite. There is a fitness room - which we weren't able to use, and a laundry room - for which I was *so* grateful as we desperately needed it by that point in the holiday. It cost 300 yen for a wash, and 500 yen for a wash/dry. I tried to put in coins but it didn't work, so I put in a thousand yen note and that worked just fine.
The room itself is small by western standards, large by Japanese standards. The beds are comfortable, though they had the same issue as the other western-style hotels we stayed in: there was a faint scent of stale sweat on the pillow and quilt. I used my travel pillow and made sure the quilt wasn't pulled up to my face and it didn't bother me too much.
There were great amenities: toothbrush/toothpaste etc as well as robes and slippers. Even better, the bath had a drying line - SO helpful!
Directly outside the hotel are many restaurants. If you have breakfast included you are given a voucher which you take to Royal Host just outside the hotel door. It is a small breakfast buffet including both western-style as well as Japanese breakfast items.
All in all, a very comfortable, clean hotel in which to stay. I preferred it above the Hilton Yokohama simply because the bed didn't smell as much. Not as centrally located though.