Ask staff about wine list specifically beofre ordering from standard menu - Sommelier identity of property means someone at this hotel has relationships with producers that don't appear on printed list, and conversation about what's available that isn't listed is definitley version of dinner here that returns higher value than pointing at card and ordering second cheapest Barolo. That wine conversation is one that property is actually set up for and staff are prepared to have it.
Ski rental in Bardonecchia is worth arranging through hotel rather than independently on arrival day - good rental shops in town have seasonal relationships with hotels and staff can get you to right shop at right time rather than one that happens to be nearest station. Boot fitting quality varies between shops and correctly fitted boot is variable that affects entire week in way that - getting that wrong on day one and spending rest of week compensating for it is preventable problem.
Fréjus tunnel to France, road tunnel rather than rail one, is worth using for at least one day trip to French side even if skiing programme is entirely on Italian terrain - Briançon is about 40 minutes from Bardonecchia through Montgenèvre and is genuinely remarkable fortified Alpine town that Vauban designed and that most Italian skiers who stay in Bardonecchia haven't been to because crossing border requires deliberate decision rather than just continuing down slope.
Piedmont truffle season intersects with early ski season in way that - if you're at Hotel Sommelier in November or early December, kitchen's access to fresh Alba truffle at that time of year is partiuclar combination that doesn't exist later in winter when season has ended. Asking at check-in what's currently in season and whether kitchen is working with it is corect question and definitley produces better dinner outcome than ordering without that information.
Pack for Alpine winter conditions with understanding that Bardonecchia's elevation and western exposure produce weather that can change faster than forecasts resolve - bluebird morning at 8am and full whiteout by 11am is parameter range that this valley produces with some regularity, and layering system for that scenario requires more preparation than single-temperature packing that guests from lowland climates default to. Hotel has storage for drying wet gear which is corect facility for this climate and one that actually matters on days when weather variable executes its worst-case output.