Location is very convenient, 10min walk to Ueno JR station, 3min to Inaricho station.
Apartment is clean and the space was comfortable for 5 of us, plus point is everyone got a proper bed to themselves. Living/dining area was big enough for us to put our luggage and sit around.
YK responded very quickly and was very helpful and friendly.
The apartment can be a tad cold. Heaters are found on each end of the apartment but the rooms itself and toilet can be slightly cold. Blankets were fluffy and warm though (which helped alot!).
With only one toilet, the bathroom schedule was abit difficult for our group of 5.
Pocket WiFi was not available as the previous guest lost it.
Overall still a good base to explore Tokyo and near the Shinkansen station which is great if you have the Japan Rail Pass.