It's a city house a few blocks away from the tip of Yanaka Ginza, with actually two floors. The ground one has a kitchen, dining table and a sofa, while the upper one has the bedding. Both have a toilet and a bathroom.
The house itself is located in a small street with some bars, restaurants, and snacks. It's funny to hear drunk salarymen in the evening doing karaoke in the latter, as it bring some liveliness to the somewhat empty Tokyo (July 2022)
This part of Bunkyo (Yanesen) doesn't look anything like Taito (Ueno) as it has fewer traffic and no tall buildings. One can just wander in the streets while looking for the Showa-era houses and trying out the many different coffee shops there.
Mitsuko always answered our messages in a short time and provided us with two keys. Only on the checkout day I noticed that the next door was part of the same house and that there were slippers in the closet at the entrance.
Nippori station is less than 10 minutes on foot, which is very convenient when coming from Narita airport via the Keisei line. There's also the Chiyoda subway line, although it roughly commutes to the same touristic spots as the Yamanote line as it almost follows the same loop clockwise.