As a Host Tomo was really helpful giving us plenty of information and help when we required. The location of the Place is a five minute walk for the Yamanote line which enables you to get around the different districts of Tokyo easily.
Night life in Otsuka isn't as busy or loud as other places in Tokyo so its a good place to stay for those who want somewhere to retire to after a busy day and for those who want to go out later than the trains we spent several nights in Ikebukuro which was about a half hour walk from the house.
The house was comfy and a nice blend of modern and traditional. It fit the five of us easily and would have still been comfortable with six if groups are willing to share the three rooms. The hose has a large living room dining area and kitchen with everything required to cook however we didn't use it instead going out for food every day.
Finally the Wifi card supplied was one of the most useful things imaginable and made working our way around Tokyo easy for the first few days until we got our head around places in the city and its public transport. If you are going in a larger group and you all want to do different things i would highly recommend you rent another one in the airport. But for us we managed comfortably with the single one provided by Tomo which was stable and throughout the holiday with fast speeds and great coverage.
Overall It was a pleasure to stay at this location and would use it again if I was going with a group of 3 or larger as the space is better equipped for larger groups. It comes highly recommended from me.