The Prince Gallery hotel is located on the top floors (30-36F ) of Kioi Tower, part of the commercial complex Tokyo Garden Terrace Kioicho. 1-4F are Kioi Terrace with a few restaurants including a 24hr cafe called Famima. You can get coffee and breakfast food at some of the restaurants (opens at 8am on week days) if you get bored with the hotel breakfast buffet. There is also a direct connection to Nagatacho Station on 2F.
The room was nice and modern. The lounging area in front of the huge window was my favorite hangout spot.