Kuniaki was super responsive and very friendly. Based on the reviews I had high expectations of the apartment already, and everything was just as expected - clean, fairly spacious and comfortable. It was a quiet and safe neighbourhood (so definitely not a party area), walking distance to Shimokitazawa (worth checking out) and only about a 5-minute walk to the metro, and a 10-min trip to Shibuya. He left a personal note for me upon arrival, definitely a nice touch!!
I will just note that even as a fairly small person, the shower was quite small for me.
Thanks Kuniaki!