We liked having a tatami area to sit and relax, although it would have been nice to have more cushions to sit on. Although we never put the TV on it did get in the way when going up to the tatami area and worried that we might knock it, especially when it wasn't positioned to be viewable from either the bed or the raised area.
The light switches were awkward to use and had a really bright blue light right next to the bed and as a side sleeper this was right in my face so did disturb my sleep somewhat.
As the hotel is unstaffed don't get pocket wifi or anything delivered to the hotel as they cannot guarantee there will be anybody available to accept it, we realised this too late but were fortunate that the cleaning staff were able to accept our delivery and it was put in our room ready for our arrival but we could have avoided some stress for ourselves by having it delivered to a local collection point instead.
Overall we enjoyed our two week stay, the hotel is in a quiet area close to amenities at East Side Square and Higashi-Shinjuku station for easy access to the Fukutoshin and Oedo lines.
