Nice hotel, american style. US room size, clean, accomodating, very american. BUT... the property is isolated and you cannot walk around as per the concierge "there are wild dogs" surrounding the prooperty. I saw a pack of them as I walked to the bus stop. Taxi ride to center city is 20-40 euros depending on time of day. You can buy a bus ticket from the gift shop for 1 euro to take the bus to the metro and the metro to the city. This takes a while buts saves good money. The hotel provides a shuttle, but it is 10 euros round trip and you must book and pay in advance. If you miss your time, you lose your money. Food at the hotel is pricey and just ok. Most employees speak english. Check your bill--upon checkout I found some charges that are still being disputed. The woman behind the desk was rude and not helpful at all. Alex is great at the front desk!

We stayed here for 3 nights (2 stays) in August as part of our tour through Italy. We always try to stay at Marriott as we're platinum.

First stay (2 nights) we did not get an upgrade at start as they said nothing is available (although their hotel website said differenty!). Then, after asking, the next day we got upgraded to a larger room that was a smoking room and had half of the furniture missing. The second stay (1 night) we got upgraded to a very nice room with balcony and big bathroom.
In executive lounge only italian papers, 1 slow computer and a non-working printer; after 2 times asking they did not fix still. We did not try to the outside swimming pool or the (large) internal fitness centre, but we found it a bit strange that you need to pay to use the inside swimming pool (which is part of the spa).
Breakfast was ok, although not that much choice for bread eaters. We did not have lunch or dinner at the hotel.

We normally always fill in the hotel evaluation card - so they can use this to improve - but there was none present in the room. When asked if they could bring one, the brought a 'linen changing card' to our room; then when asked at reception they said they dont have any at the reception. When I insisted they asked housekeeping to bring one, which I filled in at check out.

Pluspoints: very friendly parking guys, they actually gave me more tips about the area then the reception. Same for the business centre: very friendly staff.

Location
Location was ok if you have a car, but if not then I would not recommend the hotel. Shuttle bus about 8-10 euro pp retour and takes about 30-40 minutes to Rome centre. Nothing is in walking distance. We found some nice restaurants about 5-10 minutes driving away from hotel. Parking on-site about 8 euro per day. We paid about 120 euro per night.

Few words:
There's all you need, huge and luxurious hotel with all kind of services, American style breakfast with tons of food.
The best hotel I've ever seen.
Located in the periphery of rome not in the centre, I always moved by Taxi.
Only a negative note: parking for guests not free and payments must be done by few automatic cash sometimes with queues.

This hotel is closer to the airport than to Rome, but unless you take a cab you will have a long commute anywhere you want to go. It is far from civilization. They have an unreliable shuttle service so we took the subway and a bus just to get anywhere. I considered it an adventure to travel this way, but my husband didn't feel safe. People jumped out of the tall grasses to catch the bus and blue collar workers actually started wrestling on the bus once. With that said, the hotel was great! We had two bathrooms in our room with beautiful marble. This would be a cool place to have a conference if you ever had a reason to do one in Rome. For the general tourist, I wouldn't recommend it since it is so remote.