This apartment is a lovely place about 7-10 minutes walk from Gotanda station (taking into account normal walking speed and carrying a big suitcase plus occasional stops at traffic lights). It is a fairly easy and straight-forward walk on the main road from the station to the apartment so returning late from exploring Tokyo city is not a problem at all unless you miss the train :)
The apartment matches 100% the description and photos provided by Shinichi-san so you will not be unpleasantly surprised. The place is clean, tidy, comfy and spacious for 2 people and very quiet. There is also a nice balcony where one can walk out to, enjoy the view from 10th floor up and hang your laundry so we have thoroughly enjoyed our stay there recently.
We would, however, like to point out the following so potential guests can consider before booking the apartment:
1) The apartment was rather cold by Japanese standard despite all windows were closed and the heating was turned on. We stayed there in late February and at the time the temperature was around 7-11C. There was no other heater available (eg. standalone oil-filled radiators, fan heaters etc.) except a heat pump air conditioner type (i.e. air-conditoner which has both cooling and heating functions) from which warm air was generated but it was not powerful enough to warm up the whole apartment.
2) There was only one small towel rail in the bathroom to hang the bath towels and the hand towel rail was broken at the time during our stay so there was nowhere to hang the hand towel for wet hands.
3) The shower cabin door (folding/sliding type mounted on rails) is not very sturdy and can easily derail if one is not careful when using it. It had derailed a couple of times during our use but fortunately it was easy to fix and mount it back onto the rails so we could continue to use the shower cabin without flooding the bathroom.
Overall we would rate this apartment 90 out of 100. The issues mentioned above are not critical and should Shinichi-san find ways to improve them the apartment would surely score 100 out of 100!