The apartment and Marco were both great.
The Apartment is jsut next to the Vatican City, very near to Castel Sant'Angelo and near to Trastevere.
Pantheon is 15 min walking. Colloseum and Spanish Steps are 25-30 mins walking or one bus. You can also use electric scooters (Lime etc).
The neighborhood is safe and the building and apartment are clean.
Marco is a very nice host, he was just on time and friendly. He gave clear instructions on the apartment and local tips for restaurants / touristic attractions.
I would definitely recommend this place!