Wow! What a view and what a location. We had a fantastic 7 night stay at Vita's place and would not hesitate to recommend it - the view is exactly as it looks in the pictures if not better and it is just magical to look out in the morning or early evening at Trajan's forum.
The location is very convenient to the Colosseum (5 minutes away) and close to all the major sites in Rome. The area is full of great restaurants and bars. We walked everywhere -- the Vatican is probably the furthest major site at about 40 minutes' walk but there are many cool things to see on the way like Campo De Fiori, the Jewish quarter, Trastevere, the river Tiber, Castel St Angelo, etc - it's a perfect tourist trip. We didn't take public transport because taxis were so easy and cheap - when we wanted to get to St Peter's Basilica early in the morning, a taxi was less than 10 euro.
The studio itself is very comfortable and has been well designed / laid out. There is a little kitchen area with tea/coffee facilities, a hob etc (but who'd want to cook for themselves while in Rome?!) and various amenities. The shower is good and warm and it's pretty cool to see the forum from the bathroom window while you're on the loo (!). The aircon worked well and there was also a very good & quiet fan which we used overnight.
The fold out couch bed is OK - very creaky. I would prefer an real bed as we never used it as a couch, and there's enough space in the studio to allow a real bed. That was the only negative (ish) part of our stay. Our sleep was generally good though; the area around the apartment is quiet and we had no noise from any neighbours.
Once you have booked, make sure to contact Vita using Whatsapp if you can, rather than Airbnb messaging, as we had issues with the latter and weren't able to organise a car pick up as a result. Otherwise Vita and her mother Francesca were kind and friendly. Her mother gave a fantastic tour of the property considering that she spoke little English -- everything was very clearly shown to us: which key to use where, how to use the air con, how to open the bed, where the maps were, etc. We were grateful for her help.
Finally, one thing I wanted to mention was that another guest has referred to "local men standing right outside our apartment harassing us to buy beads every morning". We encountered the bead/bracelet sellers everywhere around Rome, and found that if we ignored them they ignored us. Just don't engage, keep walking, and they won't waste their time with you. The area around the apartment is well lit and we always felt very safe, even coming back very late at night.
We had an absolutely marvellous trip to Rome and can't wait to go back. I strongly recommend Vita's apartment -- as far as Airbnb's go, I couldn't imagine much better. I will be dreaming about that view!