Junya's house is perfect for every Tokyo travelers. It is closed to the JR koiwa station just 2min and there is a Airport Limousine bus stop for both Narita and Haneda. Also there are quite good places for tourist near Koiwa station e.g, Donkihote or Daiso shops for souvenirs shopping :)
The house is fantastic as well, nice room , balcony, inhouse elevator, spacious area and very attention in details. every thing is well organized.
But the best part is the host Junya, He is so sweet, I recomend hime to everyone!