We had a great time at Marco's apartment, it was exactly as described. In a great location just a few minutes walk from the Termani station. Nice and clean, comfy bed and great shower. There's an excellent restaurant right under the apartment called Cecio that you have to try if you stay at Marco's.
Excellent communication from Marco right from when we booked and he was there to show us round the apartment as planned. If you are sensitive to noise at night I'd recommend taking earplugs as there was some noise from the street and surrounding apartments. Luckily I bought ear plugs as I am a light sleeper so no big issue.
Would definitely stay again if I were to visit Rome.