I was afraid if this apartment being too far from the city, but Funabori Sta. Is just 5min walk away and Shinjuku Line which will leave you in Shinjuku in 30m or in Akiba in about 20m , so it ended being a total win.
The apartment is bigger than the average you may find listed for Tokyo, it was clean, and having a kitchenette and a washing machine were nice extras.
The Onsen located in the neighborhood is so convenient, and have some cheap prices for the amenities. Masa-san provided free entrance tickets also. What else you may ask for?
Beside all this, the documentation provided was pretty accurate and covered almost anything you need to know about your staying and options in the sorrunding.
In overall I highly recommend this place and I'll try to repeat on my next trip to Tokyo!