The place is actually good for family and big groups like 6-8 people. Also, the building is strategically located in between station ( Yotsuya and Yotsuya-chome station) and along the main roads so you can’t miss it. And if you plan to travel around Japan via JR pass, Chuo line which has a line in Yotsuya station is included in JR PASS (you will save more yen) and it’s near Shinjuku (where shinkansen has a stop)