We are a family of 4. Our stay was in February where it was around 7 - 13 °C outside.
Very accessible from the Ueno Train Station, the closest exit entrance was the Iriya Exit, although it’s still a bit of a walk to the nearest gate (Iriya gate).
Room was quite clean. Room Space was alright for the bedroom area. With the added corridor for the kitchenette and bathroom, some pacing around is doable. However, only two dining chairs were provided. It would be perfect if there are additional chairs/stools.
The beds were comfortable, or so I’m told, I got the sofa bed which was pretty comfortable. Each bed had their own power sockets, even the bunk bed and sofa bed.
The toilet and bathroom were spacious, and came with a bathtub too. Due to the lack of a room heater (not water heater), the bathroom does get cold fast, especially when one is drying up and putting on clothes. The only con was that the bathroom drainage clogs easily.
Overall, Good stay. Recommended for families of 4.