Staying at Ban-sans place was very relaxed. The room was as described, no unpleasant surprises. Futon was comfortable. No shower in summer months was also doable by taking towel baths and a visiting the closeby public bath every other day (every second Sunday of the month for 10yen!). Ban-san is a lovely person, always smiling and always ready to help. My flight was delayed by more than 24 hours so I could not stay in the room for the first night and I got reimbursed for it even without asking. He and his friend Hide-san were so nice they even took me out for typical Japanese soba noodles!
Be sure to make use of the provided bicycle! Tokyo is great for biking.
Thank you again Ban-san and good luck with everything!