Our Party consisted of 8 rugby players over for the Italy V Ireland 6 nations game. On our arrival the manager rushed out to stop us unloading the minibus and told that due to an unforseeable event our rooms were not going to be available. He then informed that we would be happy with the alternative he had selected for us.
We were taken to a 350 euro a night castle and picked the next day by two taxis that he hotel laid on.
Outstanding recovery from what could have been a disaster.
Rest of the trip was great with the hotel staff friendly and efficient.

Roma Domina Cassia:

This hotel is very nice and clean. The workers were great. However, it is WAY too far from the center of Rome. Unless you do want to get away from the center, I wouldn’t recommend staying at this hotel. The room and bathroom was very clean and overall, a good hotel.

Positives first: the hotel is clean, the facilities are modern.
The bathrooms have beautiful marble and nice fluffy towels.
The breakfast is good.

Negatives:
it shouldn't be considered as in "Rome".
We left our central hotel to go there to attend a wedding nearby, it took nearly 1.5 hours from Termini station to get metro, then train and then taxi. Friends got a taxi from Termini for €30. If you were en route somewhere and had a car it would be fine but it is simply too far to sightsee in Rome every day.

We specifically booked a non smoking room. Our room stank of smoke and had ashtrays. I asked to change room and was told that the hotel was full and that it would not be possible and to ask again tomorrow. I asked the reception guy to mention it to his colleagues and he gave me a shrug. In the end I didn't bother mentioning it as we decided to leave.

We had no hot water at all for both nights and days that we stayed there. Neither did any of our friends who also stayed there. One friend complained and was told that the hotel was completely full and what did she expect!

We checked out a day earlier and happily went back to Domus Praetoria near Termini.

I stayed for 4 nights in May of 2005. Booked thru Expedia and photos are realistic. Very nice and clean rooms, bathroom, good AC. Facility in general is well-maintained. Breakfast buffet was excellent and very complete (eggs, bacon, sausage,etc). Hotel staff was very nice and always willing to help. Although far from Rome, hotel offers a free shuttle to nearest train station which is 15 minutes away from St. Peter. Shuttle also offers daily trips into central Rome back and forth, you just need to book as seating is limited. Shuttle is comfortable and with AC. If coming back late at night, I suggest a taxi. I took bus back and it took too long. Local grocery store accross the street with local/low prices. You will be surprised how much food you can get for 10 euros. I would definitely stay again.