Seagull's place is roomy (for Tokyo) and very close to train stations and a few very active local shopping streets. He's an attentive and thoughtful host who really put in a lot of extra effort while I was there, giving directions around the local area and ideas about stuff to do in Tokyo. He even helped my buy a gift for my brother through Amazon Japan while I was there.
The tatami room was really comfortable and the bedding was warm, plus there was ample storage space so I wasn't just living out of my suitcase. The kitchen's cooktop was powerful and incredibly reliable, and had a really nice grill for toast, but in terms of pots and utensils it was a bit underequipped. The place really needs a new set of towels, maybe some new curtains.
I had such a lovely time here, and the apartment was great in all the most important ways, it just needs one or two cosmetic changes and some sprucing up and it'd be my perfect AirBnB for Tokyo.
(Note that it's probably a difficult place to stay in if you don't speak any Japanese, or don't like a more Japanese-style apartment).