Had a good time here at Hilton. I would contact the hotel early to enquire about their shuttle services and timetables, as taking a taxi from the nearby train station could be quite costly, when you may be able to make it onto the hotel shuttle (or local bus) instead. Recommend catching the hotel shuttle from either Kutchan station or Hirafu welcome center (as shuttles may become full after these first few stops). If you choose to take a taxi, then the closest train station to the hotel would be Niseko station.
The Hilton was incredibly convenient for access to Niseko Village, with the ski hire facility and ski lifts right outside the entrance.
The onsen also has to be one of the best parts of this hotel. Such a relaxing/rejuvenating experience after an entire day in the cold. It's separated by gender, and there's an indoor and outdoor onsen section for each.
The breakfast was good but not amazing (on a clear morning, there are impressive views of Mt Yotei from here). There are a few cafes around the hotel (not within walking distance, but the hotel shuttle does stop at some of these places), however, they all seem to open just before midday, so your only breakfast option before a day of skiing really just the hotel breakfast - unless you decide to shuttle/bus/or drive into the Hirafu town center (lots of good dinner options here).