Masakatsu's apartment was amazing: close to metro station, great neighborhood, very close to a big supermarket that is open till almost midnight, lots of convenience stores, restaurants nearby. The apartment was super clean and equipped with all the amenities you would ever need.
Onsen was an interesting experience as well: very soothing.
Masakutsa was himself very friendly and helpful. Everytime we needed help or his guidance, he was there.
We'll never stay in a hotel anymore.