This place was great for me. Kei was super communicative and responded within 10 minutes AT MOST. He was always available to answer any questions I had and helped me figure out a few of the functions of the apartment that I was less familiar with, being from out of Japan. The place itself was super clean, well-kept, and felt like home. It was extremely convenient to the Takadanobaba Yamanote Line station, and there are also some great, small izakayas nearby. The 7Eleven is literally across the street (maybe a 30 second walk) and like other konbini (convenience stores) in Tokyo, it's 24/7.
I'd highly recommend this place to anyone visiting, and for the price, you really can't go wrong! Thanks again, Kei!