Stayed at Kadoya Hotel with my family of 4 (2 adults, kids ages 8 and 12). We had a room with four single beds. This is Japan so obviously we are not talking about a spacious room, but it was adequate for our needs (though we travel light compared to many people - just a cabin-sized luggage each). The bathroom was great, the beds comfortable, the temperature adequate, and of course you can't beat the location for easy access to transportation, shopping, and everything Shinjuku has to offer; there are three convenience stores within 30 seconds walking, too. Check-in was seamless and when we needed little things the staff was also able to help us. We'll be back!