Nice and quiet renovated hotel.
A good adress for business trips. Business price affordable.
Excellent location.

Over the years I tried several different hotels in Turin, none to my complete satisfaction. Now the NH Santo Stefano might be the right place, and I will certainly book there next time I have to go to Turin.
Online reservation through the NH site was a pleasant surprise: no credit card was required if you guarantee your arrival by 16.00 (4 pm).
The modern (or perfectly restored?) building is in character with the surrounding monuments that range from the roman Porta Palazzo to the composite cathedral. Beautiful lobby, open from ground floor to the top of the building, unusual for Italian hotels. Take the time to go to the terrace on the top floor, to enjoy the view of the center of Turin
Spacious room (a deluxe double) with pleasant and convenient modern furniture, also the bathroom (shower, no tub) was spacious and with the usual NH kits (including toothpaste, toothbrush, shaving cream and razor). When we (I was with my wfe) arrived there was only one towel per type, we forgot to ask for a second set of towels, but when we returned in the evening we found two of everything - way to go.
The only small inconvenience was that the thermostat apparently resets to the defaults when you leave the room, so you have to set again your preferred temperature and fan speed.
Despite being on the first floor overlooking a street with car traffic the room was very quiet, and we did not hear any noise with the windows closed.
Excellent breakfast (included with the price of our room), with a good choice of meats, breads, juices, etc., plus a complimentary newspaper.

Although wifi in the room was promised on the booking.com site, only wired internet was available. Useless when you travel with ipads. The free wifi in the lobby was slow and often erratic. The design of the hotel looked great but proved dysfunctional in practice. Airco on our top floor suite could not cope with the summer heat, with unacceptably high temperatures until deep in the night as a result. Shower was dangerous with three slippery stone steps to a deep bath tub. Reading lights at the bed were too feeble to comfortably read by. We were told at the check-out that as the hotel is located in a limited access zone, we might get a hefty fine when filmed by the police driving out of the hotel parking. Complaints handling by management was unprofessional.

Stayed two nights while visiting friends. Very central and right near the market which is really good to visit. The room was clean the bed comfortable and the bathroom a good size.
The only problem we had was with the air conditioning which did not work very well and was a bit noisy I was glad I had taken ear plugs. Banged my head on the sloping ceiling too!!!
This did not detract from the excellent location of the hotel and all in all it was just what I had expected from the other reviews and I would stay here again,