Sara's place is wonderfully located right across Piazza Vittorio Emanuele II. The park across the apartment is full of life during the nights and even had cool events with live music and food. She will send you a link of all the phenomenal restaurants located nearby that locals only dine at. I'd highly recommend eating at Trattoria Vecchia Roma which is right around the corner from her place. Hands down the BEST restaurant we ate at during our 7 day stay in Rome. The apartment is walking distance to the Colosseum (about 15 minutes) and also close to the train station (Termini).
Sara was incredibly easy to communicate with. She was even kind enough to reserve us a taxi on the day we departed (5 AM in the morning!). She also provides you with a portable WIFI device which you will give you WIFI everywhere you are in Rome.
The apartment itself is modern, clean and stylish. More importantly it has central Air Conditioning and that was a huge plus given how incredibly hot Rome was when we were there.
I'd definitely recommend Sara's apartment to anyone visiting Rome!
Grazie Sara!