This was my first time using airbnb and I couldn't have asked for a better host. Federico wasn't able to be there to greet us but his friend, Tomas, was and he was very welcoming. Also, Federico generally replied to messages within minutes and was very accommodating to changes in our schedule.
On arrival, we were shown around the apartment and given a couple things to make us feel comfortable. The guys definitely went out of their way to make sure we were settled in. The apartment is kitted out pretty well - aircons, good wifi and everything you need to make a basic meal.
The apartment is in a decent area, the biggest bonus was the tram (8) stop right outside. It takes you straight into town.
We did a fair bit of wandering around and really enjoyed the Trastevere area itself, it's young and vibrant with plenty cool bars and restaurants.
All in all, a really good experience and I hope the rest of our hosts on our Airbnb adventures are as good.