My wife and I stayed here on points recently. We found the service was excellent at the hotel with eveyone from the door man to the concierge very proffesional and friendly. English seemed to be the dominant language at the hotel.

We were in one of the smaller rooms in the hotel and it was small though since we were not in it much this wasn't a problem. It certainly would not have been good if we had are kids or if we were needing to spend more time in the room. By contrast, the bathroom was a very good size. Both were classy, comfortable, and clean.

As nice as everything was, had I been paying for the trip I likely would have stayed somewhere else. While in a very nice part of town I could have found something a bit closer to more of the tourist sites since we like to walk everywhere and this Hotel was kinda on the edge of the tourist zone. Also, for the price I think several of the other hotels in the area seem to be even more elegant but I can't vouch for that for sure.

I did think the room service breakfast was a bit over the top expensive. We didn't eat at the restaurants (though we had planned to) but they seemed more reasonable based on the location and the menu's looks pretty good.

This deluxe Marriott at the end of the Via Veneto is a classy experience by anyone's standards. Contrary to some comments posted elesehwere the hotel is trivial to access by public transport with an underground/metro entrance across the street (though it connects to a tunnel that is around a quarter mile walk to the spanish steps metro station). I would recommend the first time user starting from the hotel rather than the station, learning the tunnel, and then it is easy after that, a bit of a maze and you need to find the right borghese escalator to get to the front door of the hotel).
So, with the cheap and reliable metro access to all of the sites you will want to visit (Varican, colliseum, so on for only 1 Euro per ride) the other pluses are that this is a relatively calm and classy area of Rome, no one hustling you, plentiful expensive and also value restaurants to choose from, a safe, ATM filled neightborhood with the old Roman wall outside the door.
The concierge and front deck folks were courteous and of Marriott standards, which may sound obvious but in Rome sometimes that is appreciated!
This is an expensive hotel and one of the premier Marriott properties, but I would go back in an instant, I am a Marriott frequent guest but I do see the faults at some of their properites, there were none to be found here (with perhaps the exception that the gym is somewhat lame, if you feel the need to have the full equipped workout room this hotel disappoints in that area versus many other Marriotts).

This Marriott was really great - it felt more like an Italian brand rather than American; not that I am anti-American hotels, it's just that we like to get the local flavor. The only downside was the restaurants on this street were either way over-priced or too touristy.

This was a beautiful hotel with an ideal location for walking and travel by car out of town. The rooms were nice and very clean. Our view wasn't so great but overall it was a beautifu hotel. I felt the staff were a bit rude at times and I felt they didn't want to be bothered by an American. When I asked to send a letter and how much it would cost, the gal at the counter shook the the letter and said she wasn't sure. There were times when the front desk staff wouldn't even look up at me for assistance. Nice hotel, the Marriott name does carry weight but I had no use for the front desk help and there was a bell boy or someone who kept talking on his cell phone while he was working and was a bit upset that I had luggage in the lobby sitting while I was waiting for my spouse to come pick me up and the luggage up by car. The location was ideal and the are beautiful. Very expensive.