This was our first experience of Air BNB and we were not disappointed. Our host, Valentina, was absolutely wonderful from start to finish. Very communicative prior to our arrival and kept in touch throughout our 3 night stay, just checking in to see if we needed anything and whether we were having a nice time.
The apartment itself is gorgeous and beautifully decorated. Also, very clean and has everything you need for your stay. There is a Carrefour just around the corner which was perfect for supplies.
Location wise, it's great for the Vatican but you are a little further out for the centre of Rome. We didn't find it a massive problem as the walk into the centre is beautiful and well worth the effort. Don't bother with a Roma Pass as you won't need it. The metro system is dire and you are better off walking as I said.
As for Rome itself, it lives up to all expectations.