Okubo is known as "korean town." I've never been there, so I know next to nothing about it though. Maybe it's like kabukicho at night? hmm
I'm unfamiliar with Japan hotels and how they do things but I guess maybe you can ask for an extra futon but they dont have a picture or anything I have no idea how the room looks like. Or maybe you can go for separate rooms for all 3 of you, or 2 same room and 1 different. Tho if you want same room for all 3 person then takadanobaba one is a good choice.The Akibahara one.. i love it alot... but i email them ... they never reply me and as we have 3 person going together.. what they provide will be 1 bed and 2 others have to sleep on the floor... should i get 3 beds in other places instead?