What a location! Five minutes walk from Spagna Metro (and thus 3 stops from Roma Termini). The street itself is lively and chic without being noisy and as the apartment faces into an internal courtyard, rather than the street, it was very quiet, despite the central location. Importantly, as I was alone, I also felt very, very safe.
The accommodation was even nicer than the photos. Comfortable, characterful and fully equipped - right down to books in various languages, a very wide selection of CDs and wine and olives upon my arrival. There were coffee, tea, oil, salt and pepper etc in the kitchen and the fridge was even stocked with butter, bread, jam and yoghurt. The private terrace is huge and such a bonus - lots of plants and pretty little lights that come on automatically at night.
Elisa herself (and her colleague, Elisabetta) were always available and were very communicative in advance, meaning you knew exactly what to do before you got there. Extremely helpful and friendly.
I would recommend this apartment very highly and would definitely stay there again.