Appartment is exactly as advertised. Looks great, and comes with everything you would need (incl. hair dryer, washing machine, coffee maker). There were only 2 of us in the flat which made the space very comfortable but it's easily big enough for 4 too. The host was very responsive. Gave great tips for restaurants on our arrival (we tried 2 of them, and both were excellent!!) and was very friendly in general.
The location was perfect for us. Very easy to get to from the airport, and lot's of great restaurants around (most within a 15 minute walk). Keep in mind it's still a little bit of a walk from the historic centre but that is easily accessible by public transport, as is the Vatican.
The area seems to be very multi cultural and you'll also find a lot of Asian restaurants (and a bubble tea shop!) around. Not to mention great ice-cream shops, specifically Gelateria Fassi.