I really enjoyed Marina's flat and would recommend.
It is located right beside the main train station so easy to get to/from the airport.
The flat is gorgeous, clean, has air conditioning, and is comfortable. The air conditioning can be a bit loud at night but it's not a huge problem.
Check in was great. Marina and her husband met me and they were super nice, gave me tips, and an orientation of the flat and Rome. They're so nice and patient, even though my train and flight were delayed.
The only complaint is that the location, though convenient to/from the airport, isn't the most centrally located in Rome. Unfortunately, the public transportation system in rome isn't very well organized, on time, or connected, so it does take a bit of time to get around town. Nonetheless, I would stay here again and I really appreciated my stay!