Koji and Nami are very sweet young couples we met in Tokyo BNB. The descriptions about their lovely home are just as same as other reviews written here--- the room is really spacious, clean and cool, the welcoming juice is Oiishi, the host are helpful and friendly, the toilet is marvellous.....
What I should add on is---Koji is really full of humour and always make me laugh. The restaurants and park(good place to bring kids there, my sons love the 10 meter long slide) recommended by Nami are wonderful. I missed the bakery shop near their home which participated and won in Japan big pastry competition before. The cakes are one of the best I tried in Tokyo and it cost cheaper while compare with the department stores in city area. The restaurants around are really good and cheap.
I think for those who wish to travel from Narita Airport, Koji's place is a good choice for you to use Keisei Line. If you having bulky luggage, you may press the "call out" button to ask the station officers to let you use elevator. The station is not within Tokyo Metro lines but it's only 3 stations away from Skytree押上，it cost 152 Yen per trip. But it's a good experience for my family to explore Japanese lifestyle.
Next time we will come back here again. All the best to K-family and the new born twins.