The flat is very near from the heart of the city. Even if it's in Shinjuku, it's a little bit complicated to go to "shinjuku center' just by subway, you have to change some times but it works really well and japan subway is fast.
We have very nice neighbours so it was perfect but for whom want to cook in the kitchen, there are the shower cabins in this room so you have to be sure that anybody is cooking to go to wash yourself. But all is very clean, climatisation is perfect, we have some snacks to taste at our arrival.
Very good moment in the flat. Unforthunaly we didn't meet Shin but perhaps another time.