During our trip, we stayed at both the 151 Building (deluxe triple room) and the Annex Building (standard twin room). If your preference is style over cost, then I would recommend going with the 151 Building as the room is more updated and newer. Rest assure that no matter which building you go with, you will have a clean and comfortable room to rest up after a long day of exploring Tokyo. With the understanding that hotel rooms in Japan are on the smaller side, both the 151 and Annex rooms were more spacious than we expected. You might need to be slightly creative with how you arrange the bigger pieces of luggage, but our group was able to walk around comfortably. In the 151 room, we especially appreciated that the toilet is separate from the shower. During our stay at the 151 Building, breakfast was included at the Old Grill House. While the buffet selections didn't change day to day, it had a good mix of Western and Japanese food, so our group always had a good meal to start the day with. Special shout-out to the reception/check-in desk staff, who were always very friendly and helpful! One of the staff was even kind enough to bring a forgotten item from the taxi to our room at 11:30 at night!