I stayed in Sei Ko's rooms twice over my week in Tokyo. Rooms were very comfortable and it was great that we could accommodate 5 people in one room. The in-room Wi-Fi is AMAZING super fast we had 56 megabit download and 48 megabit upload which is way better than most hotels I have stayed in. The icing on top of that is Sei Ko provides a portable Wi-Fi hotspot to use around town when you aren't in your room. Which worked out perfectly since my girlfriend and I both ran out of the 1GB Of Data we had purchased fairly early in our week.