We had a pleasant stay overall. The apartment is exactly as pictured. Very new and clean, cosy, and just enough space for two people with big luggages. It's located in a very convenient location with the train station directly opposite the road and shops all around. We were sent a guidebook with lots of helpful information before arrival and self check-in/out was easy.
A few things to note though. This apartment is on the third floor with no elevator so you would need to lug your bags up three flights of narrow stairs. There is also construction going on currently next to the building so you will be woken up early in the morning by hammering and drilling. We didn't mind it much since we wanted to wake up early to explore Tokyo anyway, so it served as our alarm clock. Of course this is out of the host's control but important to note for light sleepers who intend to book in the next few months.
Our least favourite thing about the place was that the pillows were more like extremely soft and flat cushions. There were other cushions on the bed but none suitable for sleeping. Some standard pillows would definitely make it a more comfortable experience.
However, all these are just minor points. It was still a lovely stay and we would recommend it :)