We stayed 3 nights at Nicla's place. Communication with Nicla was efficient. The airbnb is just as shown in photos, and was clean and spacious. Nicla's husband also wrote a very detailed house manual with directions and restaurant recommendations.
In regards to the location, it is around 10 minutes walk to the Trastevere Station, which is convenient to reach Rome Termini. There are only around 2 trains every hour. It took us around 30 minutes by walk to reach the main Trastevere neighbourhood. We frequently used the mytaxi app. The price of the airbnb is fair reflection of it's location.