The rooms are spacious, the grounds are stunning and the pool is beautiful. We loved the breakfast buffet and the fancy restaurant. The casual restaurant in the old wine cellar is very cosy with great food as well and a friendly staff. The staff everywhere were great as well. We had two young children and everyone was very accommodating. We will be back!

We stayed at the Castel Monastero at the end of October with our 4 children. The rooms were adjoining and shared a common entrance so was ideal for us. The arrival was a little delayed by dad's trust of the GPS directions (beware the exact address entered resulted in a random choice 20km away!). The staff throughout our stay were excellent and helped arrange restaurant bookings and horse riding for the girls. If I had any criticism it would be that the inclusive wine tasting meal required a little more prompting than suggested by the title to sample the wine. In all my wife and I tried two wines and apart from the first glass we needed to ask. The meal itself was good but the following evenning we had a truly excellent meal at La Bottega del 30. Also the breakfast was a little disappointing in both the selection and simple issues like keeping the juice or milk replenished at the self service buffet. To finish on an up note the spa was first rate and our overall impression was of a very family friendly run establishment. We would come back again.

Harriett at the excellent Bailey Robinson travel company recommended this hotel. We were not disappointed. On arrival we were greeted by friendly staff (as all the staff were). Our room was on the first floor near the Spa. The room was excellent and well furnished. Noise from guests in the room above was sometimes a problem (recommend a top floor room). Facilities at the hotel were excellent. Breakfast excellent (hot food not kept hot though). We tried the Cantina restaurant for dinner-excellent. The Gordon Ramsey restaurant where breakfast was served was not as atmospheric. Plenty to do around the hotel and plenty of little restaurants in surrounding villages.
All in all a 4.5 star hotel with 5 star staff.

The setting and rooms are impressive, blending modern and traditional elements. The junior suite is large, with a sizable bathroom. The mattresses are very hard but we had a good night's sleep enjoying absolute silence and darkness (wood panels completely cover the windows).

Breakfast served in the room was nicely organized and set down. The bathroom was not cleaned to our standard, as hair was found on the wall of the shower (obviously not mine. . )

Staff may need some additional training as we were often called on the room telephone while we had the "do not disturb" sign on (for example to ask if we needed turn-down service). Additionally, staff at the reception are not fluent in English but friendly nonetheless.

Our friends in the Royal Suite (Room #3) woke up in the middle of the night with water dripping on their face - - it was an unusually rainy month and the ceiling was dripping. Be mindful that this is an 11th century monastery, albeit renovated. Staff were somewhat helpful but no compensation or room change was offered.

Dinner at the Gordon Ramsay restaurant was delicious, complete with a heavenly chocolate and white truffle-infused souffle. The Cantina restaurant also offers delicious bistecca fiorentina (T-bone) and a good choice of wines.

Good location, about 20 minutes from Sienna.