My husband and I stayed in Mas-san's apartment for a week in March 2020. It's such a beautiful space, really minimally and stylishly designed and decorated. The bed was so comfortable to crash in every night after a day of exploring Tokyo, and the shower room was very special indeed. Most of all Mas was super easy to communicate with and checked in to make sure we were happy and if there was anything he could do. The location was also awesome - very lively and super connected to Tokyo's incredible transport system (the trains were just amazing to watch out the window). Five stars.