Although at first sight the area might appear deserted and the hotel abandoned, it is actually far from truth. The hotel is very clean and modernized inside. The staff were fluent in English and were very helpful. I'm not sure if our room was standard or upgraded fro honeymooners, but everything was sparkling clean and the bathroom spacious. The fridge however wasn't working and one of the staff members tried to make it work but something just wasn't right. Also the shower-head wasn't switching modes but couldn't care less about that. To my surprise, the area seemed to be fairly safe, as we constantly made trips back and forth at night with no incident. But it CAN appear intimidating owing to its very quiet neighborhood. The walk to Bologna subway station is at least 10min (unless you make a run for it) and the buses take longer to get to the center, so I recommend the subway.
The full breakfast was great, something we really missed in some of our consequent hotels.
Overall, if you don't mind the walk to the subway, this hotel is an amazing find!

PS: do your research on what's closed on Mondays in Rome and what season is the "vacation" season for the locals - it would save you a few surprises when you face the closed doors of a certain attraction or restaurant

I booked Prime Hotel Principe Torlonia for three nights with Expedia as an arrangement including flights for me and my family to visit Rome during the last weekend of July. We sure appreciated the tranquil atmosphere in the hotel and the overall quietness after a dazzling, overwhelming, hot and interesting day in the historic city.
Breakfast was great and more than sufficient. Scrambled and boiled eggs, ham, salame, bacon, sausages. Fresh fruit, yoghurt, cereals, fruit juices, nice cappuccini or what ever you would prefer to start the day off with.
The rooms were lovely. Airconditioned. Except for 1 room no. 05 on the ground floor where three of us stayed in; aircon did not function. Too bad.
I surely would recommend this hotel to my friends.

I like the decoration and furniture use in this hotel. All the rooms have beautiful bedding, curtains and wall covering. Large flat screen TVs and A/C are standard. Breakfast is typical for a European hotel (i.e. cerial and some cheese/ham selection with bread).

The location isn't great. The area seems to have nothing interesting nearby.

The hotel is in the pleasant embassy quarter in the north east, too far away from the centre to walk, but a relatively easy bus ride away from the Repubblica metro stop. Still, for such a distant location it is an expensive hotel. Upon first view I tended to understand the steep price, because the Principe Torlonia looks great from the outside, and the garden, while not big, is also very nice. The big problem came when entering the room. I should point out that we didn't stay in the main building, so I cannot comment on those rooms. We stayed in one of the special hotel suites in the little, separate building in the garden. While these suites were comfortable enough, the smell of mold and fungi was so strong that one could barely stand it. Ventilation did not solve it, so it must be a persistent problem. For this price this is really unacceptable. So if you decide to stay at this hotel, request that you are in the main building.