We were so lucky to find this gem in centrally located Gotanda. We stayed as a family of three and enjoyed a good separation between the bedrooms, air conditioners in every room, traditional Japanese bath, and comfort amenities that made our whole experience seem a bit more luxurious, like the washer/dryer laundry machine, vacuum cleaner, etc.
The host, Bryan, was very easy to reach and easy to communicate with. We never got to meet him, but he made sure that we would have no problem accessing the apartment and its various features.
Probably the best thing about this apartment to us was its proximity to Gotanda station (and the whole Yamanote line). We loved the restaurants in the neighborhood too, as well the option to just stay in and eat things from the grocery and convenience stores on the next block.
The one thing that was a little hard for us was that the air conditioners seemed to work too well sometimes. One of us is fluent in Japanese (including reading) and made sure that we were correctly operating the remote control. But no matter how "warm" we set the temperature (even 25C), whether we put it on automatic or weakest fan, it would soon get too cold in the room, as it would not shut off once reaching the desired temperature. We stayed during a time where it was just too warm to have nothing run all night, so it was a bit tough. Still, we know this is barely a "problem" in a sea of potential issues during travel, and we hardly consider it when thinking of the great time we spent at this apartment.