Stayed here September 22-25. The room was far bigger than we had expected, very clean, friendly staff and nice breakfast all helped make it a memorable trip. Excellent location, very close to the Trevi Fountains and Barberini Metro station, plus lots of great places to eat.
Not the cheapest place in Rome to stay, but this is five star accomodation masquerading as three star!

Domus Julia is a great value and nice little hotel. It’s the apartment annex to the Hotel Julia, so you check in and have breakfast buffet at the hotel, which includes warm boiled eggs, sliced ham, croissants, cereals, yoghurt, capuccino. It is a fine little place, in a great location, at a very reasonable price. We had a double/twin room, which was large enough by European standards (and is pictured on their website quite accurately). It was 170EUR, with a private bath, and including the breakfast buffet. We entered our room via a nice dining room/kitchen common area. There were two other units which shared that space, and I think they are larger apartments and might suit our family of four. They offer a 13EUR shuttle from the airport, which is a big cost-savings.

We were booked into this hotel by a travel agent. The location is a 15 minute walk to anything. Hotel staff was any thing but helpful. We had no hot water for the first day. The breakfast consisted of old pastries and juice that was foaming. To enter your rooms, you exit the hotel onto the street and use one of three keys you are given into a long, dark hallway. You then have to unlock another door to get to a suite of rooms and then use another key for your room. Room was noisy, traffic and other guests. Very dark, musty. Beds had the springs coming through. Very unpleasant!

We stayed at the Domus Julia for 4 nights. The positives: the room was very clean, the personnel were mostly helpful, the location is excellent, the breakfast good. Negatives: the air conditioning remote control(necc. for its operation) had been removed and was never found (it wasn't "hot" to the Italians, so they apparently didn't think we should need the a/c); the hair dryer hose was broken (although they fixed it finally); the phone didn't work (it was fixed after the 2nd complaint, but not before we had waited 2 hours for a phone call that never came). The amount/quality of service depended totally on who was at the desk. At $200/night everything should have worked. Next time I will look for a hotel in the Trastevere district, which is in a charming and cheaper district, withing easy walking distance of all the major sites.