When we arrived at the building, we were shown in by the housekeeper to a room which was different, and smaller, to the one we booked online. After some phone calls via the houskeeper, we were able to speak to someone on the phone who was sorting everything out for Paula. He admitted to mistakenly giving our room to another guest, and as they were out and not contactable, couldn't give us the room we paid for.
We reluctantly agreed to spend the night in the smaller room; it was 4pm and we were in a foreign country, so we didn't really have much choice in the matter. We were never offered any compensation for the mistake, let alone a refund for that first night.
On the following day, when we got into the room we paid for, it was as described and suited our purposes. But the mess with the room and difficulty in communicating with our host means we cannot recommend staying with Paola (we never spoke to Paola, let alone met her. We were always dealing with people on behalf of Paola).
But we can say that the room was nicely presented, clean, the housekeepers were lovely and the location is close to a metro station and the Colosseum (about 5-10mins).