The description of this place is accurate and the area is in the central Tokyo which was very very handy!
We didn't get to meet Kotaro but he made sure our stay was comfortable and he responded our messages very quickly. This place is close to Cat street in Harajuku/Omitesando and all the stations are only a short walk away.
4 of us stayed and this apartment is spacious we didn't feel crammed in!
We would definitely stay at his place again in the future.