We travel a lot and can absolutely recommend this place! The best things are the interesting architecture and style, the cleanliness and the excellent location right next to a train station which isn’t far from Ueno, or Tokyo Station. Despite this, the place is very quiet! There’s also a good grocery shop right opposite. There is ample space inside, very rare in Tokyo, and that was great.
The quirky style of the accommodation is due to the fact that the building is actually a restaurant. But definitely don’t let that put you off - you wouldn’t guess this if there wasn’t for the little bar/grill outside, which gives you a clue. But it didn’t disturb us at all, and gave the place a unique feel.
There were two negatives for us: We visited in December and it was freezing. We live in a hot climate at the moment so aren’t used to cold weather anymore, so having no central heating was particular difficult for us! The aircon units act as heaters and using them got us through the nights but overall it was cold! Pretty normal in Japan, perhaps, but something to be aware. - Then again, it must be lovely and cool in the summer!
Another thing was that the mattresses were not super comfortable. Fine for our daughter but a bit too thin for the adults!
Finally, must mention the very good and hot shower, all amenities as expected and described.
Overall, a very good experience and we’d absolutely return, just not during the coldest winter.