Located in Tokyo Narita Airport and in the city of Kyoto. Check it out! The pod wings are gender separated. Restrooms, showers, vending machines and lounges are on-site. Basic hotels are provided notably their exclusive loungewear and slippers. You definitely won't feel like you are in an airport. However if you need anything, the conveniences of the shops, restaurants, etc. in Terminal 2 are just a minute away. Rates start as low as JPY3900 (= approximately $38) and you can get a pod for a quick doze (1 hour minimum).
I've seen similar sleeping pods at Abu Dhabi International Airport. But Ninehours takes it to the next level. I can't tell you how many times I've tried sleeping in uncomfortable airport seats (they purposely make them so you can't lay down) and cold floors.