Even though my overall stay went well, Tatsuro was quite rude with me on the phone with me when I told him I was going to be late for check-in - even though I had faced a number of difficulties that day (moving, finding a taxi, etc.). It greatly added to the stress of my day and didn't help much.
I always thought that it was a great service to be remitted the keys by the owner / apartment manager in person. I will certainly think differently in the future. Basically, the necessity to meet the owner and produce once passport at check-in is more of an inconvenience than anything else (knowing that even though this rule is clear from the start with this place, my passport info is already recorded with Airbnb's site).

After that however, I had smooth relations with Tatsuro until the end of my stay (knowing that we almost didn't need to be in contact). Tatsuro kindly allowed me to leave my luggage in his apartment for 3 hours after I had checked out.

The place is convenient - everything needed being at one's disposal and close to a station too. However, I wouldn't recommend it for a long stay as it is equipped with a one in one wet bathroom and toilet unit and, also because it is in a quite humid small building.
I find the place too expensive as well knowing that it is an "apato" and not "mansion" type of place in Japan.