Hiro's place is in Koenji which is my favourite part of Tokyo.
Koenji is quirky, relaxed and very friendly. Lots of tiny vintage shops, music venues and amazing snacks. Not over-touristy but getting by without any Japanese skills was easy.
Very Japanese hospitality experience sleeping on the roll out mattresses on tatami floors. Hiro took us out for dinner one night for amazing okonomyaki and recommended many good places to go. Very friendly, helpful host. 5 stars!!!