EUNJI L.
My brother and I wanted a small apartment in Tokyo instead of a hotel, and the price was pretty decent for a relatively big space. The walk from the station is quiet, in a calmer residential part of Tokyo. The washing machine was fairly straightforward, and they sent instructions by email and through the Booking.com app. I only had one question during the stay, and they replied extremely quickly. There was a bit of a summer sewage smell in the bathroom, but they probably can't do much about that. I'd recommend staying here if you want to be near Ueno without being right in the middle of everything.
