I only had one night in Sapporo and found the Gracery to be a perfect choice for my needs.
The hotel is located right opposite the train station, and as such is perfect for those needing to catch a train, or arriving by train. There's an underground passageway into the station directly accessed from the hotel, so you can avoid dragging your luggage across the freezing cold streets in winter. All of the sights I wanted to see in Sapporo were walkable from the hotel, although the subway system was also easy to use.
My room was very modern, with everything I needed and more. It was maybe a little small, but that was more to do with the large size of the comfortable bed than anything else.
The staff at check-in and check-out were very friendly and spoke good English and I was provided with a map of the city when I arrived.
