Located 10 minutes away from Fukutoshin and Yurakucho line metro station "Senkawa". (Take note: Advise Google Maps when looking for the location. Description of finding the accomodation begins with entering the street the flat is located in). Akira responded quickly when we had any questions or problems. With world's second busiest train station Ikebukuro a few minutes metro ride away, this is a good starting point for travelers to explore Tokyo.
Unfortunately, we found some cockroaches in our bedroom (judging from the guestbook, we were not the first with this issue) and were provided with insecticides. Also, the shower drain smells funky, probably due to Japan's absurdly high humidity.
Other than that, we did enjoy our 10-day stay in this room and wish Akira all the best for the future.