This apartment is even better than it looks in the pictures. We are a family of four from the United States and found the apartment clean, beautifully decorated, usable, spacious, and perfectly located for our Rome activities. The terraces (two!) were absolutely stunning with beautiful views and were a perfect place to sit at night and wind down from the long days. Trastevere is a very lively area filled with restaurants and people out to have fun at night - the great thing about this apartment is you can participate if you want, but if you would rather get to sleep early, the noise was minimal. Do be aware: there are about 50 steps to get up to this apartment and no elevator, so if you have accessibility issues, this is not the place for you.
We had issues with the Wifi at first but the host came out promptly and was able to fix it; the air conditioning was good (but does turn off when you leave the apartment, since the keys must be in a card slot to keep the electricity on); all beds (including the sofa bed!) were incredibly comfortable; hair dryer and clothes iron were provided; there is a washer inside the apartment (no dryer, but we used the provided drying rack); all amenities listed on the page were provided and satisfactory.
In terms of accessibility from the airport or main train station, the host will give you detailed directions on how to reach the apartment. We took a train to the Trastevere train station, then a tram, then walked for 8-10 minutes, but in hindsight would recommend taking a taxi from the Trastevere train station since rolling luggage on cobblestones is not ideal.
We loved our stay at this apartment and would hope to stay here again when we return to Rome!