To start off with Seiji is a great host and his apartment is very clean comes with a lot of amenities.
The location is of course in Shinjuku but not in the craziness of Kabukicho. With that said Kabukicho is about a 15min walk.
The apartment is located close to Shinjuku-Sanchome station that has 3 subway lines that travel through it. Tons of restaurants and coffee shops close by to pick from depending on your liking.
The neighbor hood where the apartment is relatively quiet area for Shinjuku. The neighbors in the building are quiet and courteous, please respect them with the same.
Seiji’s apartment is very clean, comes with many amenities and is great for a single or a couple. The bed is comfortable and the size of an American queen. Also the linens are warm and comfortable.
I highly recommend staying at Seiji’s apartment for you visit to Tokyo.