This hotel is the true epitomy of St Regis and luxury right in the heart of Rome. When we first arrived the porters were at our service immediately and escorted us to the front desk where they were very polite and professional. Being a gold SPG member I requested an upgrade to a deluxe room and they gave me an imperial room with optional butler service which was really impressive. The room was out of this world and felt like a palatial bedroom. The bedding was amazing, beautiful linens, very clean and the marble bathroom was up to my standard. Their luxury toiletries (Laura Tonato) were a real treat also. They gave us free water daily and an evening treat every night (macaroons, biscuits and local italian treats). The evening turndown service was lovely too they really freshened up the room beautifully. The breakfast wasnt that impressive, expected a better spread of food but the chef and our morning waiter were very polite and friendly. If you want to feel like a celebrity go for the Bottega Venetta Suite, I think this is where george and madonna stay! I wouldnt stay anywhere else in Rome now and I would highly recommend it.

We arrived in the late afternoon, our room was ready almost immediately, they upgraded our room without even having to ask. We found this hotel through AmEx travel, so we trusted that it would be top notch, and it was in every way!
The room we got did only have the view of the courtyard, but when you are in Rome, you are rarely ever in the room! The room was large, nice shower and bathtub, 2 sinks, large king size bed and flat screen tv. There was a small desk and couch area as well. I did not like that the hotel charged so much for internet access, but most highend hotels always do, so not surprised.
Upon our arrival I was very persistant about getting a private driver to take my husband and I to Ostia Antica, I had been trying to arrange this through a private tour service, but no one had gotten back to me with the details, so within minutes the concierge had a driver pick us up and take us there! It was not cheap, but the driver spoke very well english, so I was impressed!
The concierge was always willing to help with dinner reservations,etc. anything we needed, we even requested a specific type of converter for our personal use (bc our's was stolen from our luggage from Madrid to Milan) they brought it within minutes, and didn't charge us for it either! very nice...
The rooms were very clean, always turndown at night, which I like and the mini bar was always restocked. They also provided 2 complimentary waters per day in the room, which was nice too!
We ate in the Late Night Bar area twice, once for lunch and dinner, the food was good, especially nice to be able to get a sandwich & fries, which you can't find in the city, although I did think 8 euros for an iced tea was ridiculous and I mean for every glass...pricey, but I always expect that from St Regis, come on..
Overall, a great experience, friendly service and a perfect location!! Highly recommended!

My partner and I stayed here last October for 4 nights. We found the hotel to indeed be "grand" as in the title, certainly the lobby and outward facade were impressive, but overall, found it quite stuffy and rooms small for the price. We were paying nearly full rack rates at the time... $550/night (CAD) and there was nothing about the hotel worth that price tag. Staff were not unfriendly, but not out of their way to be friendly either; restaurant was nice but nothing to rave about (the real great restaurants were in the true Italian districts); concierge gave typical tourist advice and it wasn't until night 2 or 3 that he finally got it right about us looking for a trendy but truly Italian experience and then we were directed to fabulous chic... but it took a while.
The rooms were nice, again, but small... as to be expected, and even though we were paying nearly full pop for the room, we just got a courtyard view.
There was nothing really wrong with the St. Regis Grand, but there was nothing spectacular either. We have stayed at many 5 *s across the world, and this one did not to anything to really differentiate itself from its competitors.
(BTW, we arrived early and were directed to the restaurant for breakfast as our room wasn't ready. We were charged 56Euro for two cappuccinos and a pastry basket... )

This hotel was a complete failure. The rooms aren't large (although well appointed) and the closets ridiculously small. The service was indifferent. The concierge didn't get the tasks assigned to him right; the turn down service was incomplete (free bottled water on some nights and not others)and cleanliness spotty (old silverware was left in the room as was a champagne bucket and empty bottle; mess on hall carpet there in the morning and evening); the breakfast buffet stone cold; and the door staff indifferent if not hostile. It is hard to imagine a "luxury" hotel that could or would be more indifferent to its customers.