We (3 adults) liked Nikki‘s apartment very much. It is spacious, nicely decorated and very clean.
Its location was just perfect for us, as we arrived at Ueno station and departed with the Skyliner from Keisei Ueno station.
We had the JR Pass and very often used the Yamanote line for exploring the city. We usually took the Okachimachi Station which was also in walking distance (6 minutes) from the apartment but smaller and easier accessible.
There are a Lawson and 7eleven convenience store just around the corner of the building and the Ueno Park with the Shinobazu Pond for some relaxation is also nearby.
The food center in the basement of the Uniqlo offers a broad range from fresh bread to pre-cooked Japanese Meals.