Naoki and Tomoko's place was amazing! It is a small bachelor pad with a bunk bed that is maintained well. There is a pocket WiFi available which is SUPER handy for your travel in Japan. The space is clean and convenient as it is close to shops for food and transportation is very close by. There was also an information book which was a very sweet touch as it gives you the basic run down of the place and a small guide from Naoki and Tomoko of their favourite places close by. The unit is in a quiet building and your neighbors are quiet too so if you are loud, it would not be ideal for you.
The only tip I can insert here for future visitors is to bring some slippers or cozy socks as the flooring can get very cold and if you plan to bunk with friends, make sure you're close as the bathroom and toilet has no door and the only thing that divides the bathroom and toilet are two glass panels!