I had a wonderful time staying at Han's apartment.
Everything was super tidy and the bed was very comfy!
I stayed at the 8F and the view was marvelous; and definitely not common in a big city like Tokyo.
As for the neighborhood, Ōtsuka isn't maybe that famous if you think about Tokyo but i was suprised just how sweet and homey it was. There're many good restaurants and supermarkets right around the corner.
If want to escape the hustle and bustle of Tokyo and stay at a quiet place that is still near to all fancy places (Ōtsuka is a station of the Yamanote Line) this is just the perfect place for you.