Nice place! Sei gave us pretty good guide how to get to the apartment (although when I asked additional questions about the transportation, I never got the answer, so I didn't ask anything else during our trip). The place is about 7-8 minutes walk from the train station and very well connected with the center. We loved the neighbourhood, it is very nice with plenty of stores and restaurants (and a 24h open Lawson just a minute walk away).
The apartment itself is pretty small, but nothing smaller than the other Japanese apartments in the eyes of an European. But, the beds are super comfortable, which is the best thing after a long day. Everything was very clean when we arrived. As the room was on the corner of the building it got pretty cold during the nights, but it had an AC so if it is on all the time, it is ok.
All in all, it is a cosy little place and I would stay there again.