The place was really a pleasant surprise and can't say enough good things about it. Maybe the best hotel I've ever stayed at. Made you feel right at home with really laid-back but at the same time professional staff. Really friendly people.
The location was perfect because although it was totally right in the downtown, it wasn't an area loaded with tourists so we felt like we're really a part of the city's life instead of just tourists. It's elegance lent itself very well also to being romantic enough for a couple like us. All this with reasonable prices too.
When going back to Rome won't even consider another hotel. Would recommend it to anyone. Enjoy!

Night # 1 -When we arrived we were told they could not honor our reservation, so they sent us to a nearby hotel for the same price. Our room was on an incredibly busy street so the noise level all night kept us awake (we equated it with a Boeing 747 driving up and down the street.)
Night #2 - Back at Principessa in the a.m. with our bags. We were told our room was not ready, but go enjoy our day and they would put the bags in our room for our return in the evening. We got back to the hotel about 10:00 p.m. only to find our bags still in the lobby. There was no one to help us with our bags - not for us, but for the other couple we were traveling with - aged 70 years old. Our room was so small we had to move the portable heater out in order to put our bags inside the room. The bed was two single beds pushed together with a large sheet to hold them together. The furnishing were so old that the veneer was peeling off the furniture. The bath as clean but with rust stains on the sink, etc. They promised to move us for night #3 to a newly remodeled room.
Night #3. The remodeled room was GORGEOUS. So, after two sleepness nights we were looking forward to a great night's sleep in this really lovely room. NOT. The bed was stone hard - not an ounce of give to the mattress at all.
In fairness, it's tough to find a hotel in Rome for less than $200/night. I would say that if by now all the rooms have been remodeled, then take a chance - if you don't mind sleeping on a slab!

I travel for work, so as a result stay in a lot of Hotels and this is without doubt the worst hotel I have EVER stayed in.

Three points:
- The rooms are awful/dirty (nothing like the photos at all)
- The price is completely unreasonable given the location/service levels/overall feel
- Service was poor

Headline:
DO NOT STAY AT THIS HOTEL IS FAR WORSE THAN STAYING AT HOME.

Hey after reading all the reviews I was really nervous about our one night stay - as this was our last night in Rome before boarding our ship and I wanted it to be nice for my family (4 of us) We were pleasantly surprised at the beautiful room that they gave us - really - great bathroom, beautiful bed and sofa bed, tastefully decorated in European style!!! We had two balconies one off the bath the other off the bedroom. The marble floors and walls were all new. Towels and bedding were bright and looked new. Less than $200 a night and that included breakfast - which was nicely laid out we thought for continental. Don't know about the other rooms at this hotel but if you get the quad you won't be disappointed. We liked the fact that it wasn't a modern hotel, as we stayed at Holiday the first two nights and this was more what we expected to see in Europe. We thought the staff was nice and helpful. They called us a taxi, gave us directions and smiled back when we cracked a joke. Get directions on what bus to take to the hotel from Termini as this will save you a walk. We'd stay there again.