Hiro is very responsive and welcoming. Excellent location! Ota-ku is a very nice and authentic place. It's relaxing and at the same time it's only 20 minutes by train from the center of Tokyo (Don't be afraid of the word «train»... it does not mean it's the suburbs, trains are going everywhere in Tokyo.). The flat is quite small but totally ok. The couch is a bit hard and not so comfortable, but still ok.