Namio's apartment is very well located, near Ueno park, and there is a subway station at a 5min walking distance (Nezu). And there is a bigger station, a JR one, accessible via Yamanote at 15min walking.
The apartment is very clean, bigger than expected, and well furnished.
Namio made everything he could to make our stay enjoyable (small attentions like sweets, coffee, map of the surroundings, best places to eat, etc...)
He also answered each and every question we had almost instantly, and checked on us through Airbnb to make sure everything was OK.
Quite the perfect overall Airbnb experience :)