Charles was an excellent host and was very reactive to my multiple request and question. The room is not perfect (too small bathroom) but Charles compensate it by providing a local mobile phone and a power bank that were useful for our trip. Internet speed was quite good and the pocket wifi was a great help for our excursion in Tokyo.
*Need to be aware that the construction of a new building were starting 3 days before our departure next to our building and noise of circular saw, hammer and stapler starts early in the morning.