"Staff was excellent, they were polite, professional and friendly. The onsen was great, well tended, clean and friendly to tourists (however, they will not allow those with tattoos to enter). The hotel in the heart of Ueno, a block or so from Ueno Station, and in the middle of food and shopping areas. The room was larger than some of the other hotel rooms we stayed at and could fit 2 individuals and luggage without too much of a hassle.
The issues I encountered: The socket in the bed didn't work, the lamp on the bed could be turned on to the lowest setting or it spazzed out, and the bathroom ergonomics were suuuuper uncomfortable (I have a bruise on my knee as proof of how odd the experience of getting in and out of the restroom was). The bigger concerns were more security based: Anyone from the street level can gain access to the guest levels, and anyone can have wifi access regardless of guest status."