By far, the best place we've stayed in Japan. Everything is awesome about this place so I really don't know how to start.
It's less than 5 minute walk from JR Mikawashima station along the main road. There's plenty of shops and restaurants around and you can walk to Nippori textile/fabric street if you are into fabrics. There's a bus stop near the apartment that will take you directly to Asakusa for JPY 210 (adult). The best part? There's a supermarket/grocery right across the apartment where you can buy everything you need.
Now the house - absolutely spacious! Very clean and has everything you need. The ground floor has 3 sofa beds, 2 shower and bath and 1 toilet.
The second floor has 10 beds with 2 toilets and a balcony. Each bed has a trash can, a power socket and individual lighting. The beds are heavenly to sleep in after a whole day outside.
I highly recommend this place.
Mori-san is a great host and replies very fast. Thanks for the wonderful stay.