Ryusei's house a great little space for a solo party! It is quaint and cozy, so it might not be enough space for more than 1 person, but solo it's a perfect fit.
The stairs are very steep and narrow, so if you are older or have bad joints for another reason, it may difficult getting up and down the stairs.
Otherwise the house is as described in the posting. Extremely close to the station, two minutes if you catch the light. There are a few convenience, grocery, and drug stores very close by so you can get anything you need quickly. Quite a few restaurants nearby, and a very good bakery right next door.
The house is only a few train stops away from big areas like Akihabara and Ueno, and maybe 30ish minutes from bigger areas of interest in Western Tokyo too, so a very nice location.
The kitchen is a good size (I have seen much smaller in Japan), functional and comes equipped with everything you need. The bathroom is pretty large and modern for an older house, great shower!
The pocket wifi works well, but there may be a cap on it after a certain data limit (I am unsure) so you may have to watch your bandwidth.
As for Ryusei, he is a very nice host who left an area and house guide to look through. He also left lots of nice little touches like free snacks and food and was always very quick to respond to messages.
Would love to stay in Ryusei's place again!