It’s a great beautiful place, a bit small appartement for a big European guy like me but probably normal for a Japanese appartment.
It is in a very calm neighbourhood, the bedroom and bathroom are very warm and relaxing, perfect to rest after day of walking and visiting.
Also it Is only a few minutes walking from Otsuka station / Yamanote Line that can take you anywhere in Tokyo.
The only negative I can find is that it lacks an oven if you want to cook and proper dinning place but we ate outside most of the time as Japanese restaurants are very cheap so not a big deal.
The host is very friendly and responsive. I can only recommend and will happily go back if I travel to Tokyo again.