Loved Ritsuko's place in Shinjuku. The place was just as described and accommodating for our group of 8. Though the place was cold in the Winter (can't be helped), Ritsuko provided heaters for all available rooms to make sure our group was warm and had a good night's rest.
One thing I'd like to mention is Ritsuko's help in helping us locate her building. Though it could have been difficult to find on our own, she had met me up at the Yotsua-Sanchome station when I was having trouble finding my way and went out of her way for extra guidance. Went above and beyond as a host and it is truly appreciated. Would stay again!