This is a great place to stay in Tokyo and was really well located for everything we wanted to see. It's just two subway stops from Shinjuku station which gives access to the Yamanote and Chou JR lines which meant we could get to all the major sites with our JR Passes.
The apartment is tucked behind a shopping street full of useful shops and good places to eat. This gives you a really great balance of facilities on the doorstep but a quiet, peaceful place to sleep.
The apartment was spotlessly clean, well laid out and well equipped. Mitsuko is an excellent, helpful host and made arranging our stay very easy. We had a slight hiccup finding the apartment as we looked for the street name on the wall, as it usually is in Europe, but couldn't find one. It took us a while to realise that the street name was on an arch over the street, so when you are following Mitsuko's excellent directions remember to look up!