R&B Hotel was clean and with good service. The room was small as expected of this type of hotel, but everyting was spotless and all facilities worked well. It was very quiet during my stay.
The Hotel is very convenient for Shin Yokohama station, if you leave from Exit 10 you will be at the hotel in a couple of minutes. The Hotel is also very close to the Ramen Museum, which is worth a visit as the basement is full of working restaurants created in a 1950's style. It is like being on a film set. If going back to Yokohama I would definitely stay again.
It is suitable for short trip travellers without big suitcases. As mentioned in others comments, there is only stairs for us to reach the reception.
Other things are good and no big problem during the stay.