We ended up staying here two years ago - here are some deets:

• This is a very unique hotel in the Marriott portfolio - no network connectivity, no TVs, and to get here you have to drive on a tiny gravel road. I'd recommend a SUV but 2WD is definitely doable (which is what we had). They'll pick you up at the meeting point and drive you with a pick-up truck to the actual hotel.
• Rooms are very small but quite tasteful and minimally decorated - however, it does feel very authentic. I would call it 'monastery-chic'.
• You're supposed to completely disconnect here and just relax. You can perform in wellness activities like yoga and meditation, swim in the hot tub/tiny pool area, do some hiking. Most of your time will be spent relaxing and reading as well as chatting with the other guests.
• The experience is definitely not for everyone. If you have trouble disconnecting and want to be on the move always a 1-night stay would be more than enough. Otherwise a 2-night stay would be sufficient. If you're really into the wellness retreat thing feel free to stay longer.
• Meals were all excellent and vegetarian (maybe vegan? I forgot).

All in all, this is a pretty unique experience and I think it was well worth the 35K points + $89 (at the time) per person. If you happen to be in Tuscany and/or driving between Rome and Florence it's absolutely worth a 1 or 2-night stay.